KR101426812B1 - Buttoning sewing machine - Google Patents

Abstract

The present invention provides a button sewing machine capable of easily switching between a "U" character sewing and an "X" character sewing while sufficiently ensuring a width of pitch adjustment according to the interval of buttonholes.

The button month sewing machine 100 includes a button holding mechanism 40, a needle swat forming mechanism, a left and right moving groove cam 51, a substantially U-shaped sewing groove cam 54 and an 'X' A cam mechanism having a cam 55, a needle number adjusting mechanism 30, two swinging members 56 and 57 and a stitching selecting mechanism 58. The swinging members 56 and 57 The guides 56a and 57a have front ends facing each other, and the circular guide has a swinging direction for switching the needle drop position from the final needle before stopping by the needle number adjusting mechanism 30 to the first needle after stopping When the buttons are stitched by the sewing machine 100, the drop of the needle is started from the same buttonhole even when one of the cams of the 'U' character stitching and the 'X' character stitching is selected.

Description

Button Sewing Machine {BUTTONING SEWING MACHINE}

The present invention relates to a button sewing machine for sewing a button to a workpiece.

[0003] Conventionally, there are two types of hand needles for sewing buttons having four holes. One of them is sewing by a combination of parallel needle-like stitches as shown in Fig. 13 (a) As shown in FIG. 13 (b). In the sewing shown in Fig. 13 (a), after a predetermined number of needles are dropped alternately in two holes adjacent to the left and right sides, the button is moved in the front and back direction, and the other two holes adjacent to the left and right are alternately Sewing is finished by dropping the number of needles. In the sewing shown in Fig. 13 (b), after a predetermined number of needles are alternately dropped in two holes positioned diagonally, the button is moved in the forward and backward directions, and alternately predetermined Sewing is finished by dropping the number of needles.

And a sewing selection mechanism for transmitting the sewing selection mechanism to the button holding mechanism so as to switch the movement corresponding to the two kinds of sewing (for example, Patent Document 1 and Patent Document 2).

11 is a top view showing a part of the structure of a conventional sewing selection mechanism based on Patent Document 1; The sewing selection mechanism 200 includes a groove cam 203 for determining the movement of the front and back buttons in the sewing shown in Fig. 13 (a) A swinging member 201 and 202 which swing by each of the groove cams 203 and 204 and an arcuate guide 208 and 208 provided on the swinging members 201 and 202, A shaft 205 serving as a rotation axis of the grooved cams 203 and 204 and a conveying member 206 engaging with the arc guides 208 and 209 of the rocking members 201 and 202 And a feed adjusting lever 207 for moving the feed-through member 206 along the arc-shaped guides 208, 209 of the swinging members 201, 202.

Although not shown, the feed control lever 207 is connected to the button holding mechanism, and the sewing selection mechanism 200 includes a cam for determining the displacement of the button in the left-right direction and a cam for transmitting the displacement of the cam to the button holding mechanism And is commonly used for sewing in Figs. 13 (a) and 13 (b).

In the sewing selection mechanism 200, the groove cam 203 transmits the rocking motion corresponding to the sewing shown in Fig. 13A to the rocking member 201, To the swinging member (202). To this end, the control lever 207 is operated to engage the feed-in piece member 206 with either one of the arcuate guides 208 or 209 so as to perform the desired one of the sewing operations. And the button holding mechanism is operated to perform sewing of buttons.

12, the stitch selection mechanism 200A includes a groove cam 203A for determining the movement of the button in the front-back direction in the sewing shown in Fig. 13A, A groove cam 204A for determining the movement of the button in the front and back direction in the sewing shown in Fig. 13 (b), pivot members 201A and 202A pivotally moved by the respective groove cams 203A and 204A, The circular guides 208A and 209A provided on the members 201A and 202A and the shaft 205 serving as the rotation axis of the groove cams 203A and 204A and the circular guides 208A and 209A of the pivot members 201A and 202A And a conveyance control lever 207 for moving the conveying member 206 along the circular guides 208A and 209A of the pivotal members 201A and 202A. Further, although not shown in the drawings, there is provided a structure such as a link mechanism for displacing the button holding mechanism in the lateral direction as in the description of Fig.

The structure in which the movement is transmitted to the button holding mechanism by the sewing selection mechanism 200A is the same as the structure in which the swing members 201 and 202 having the circular guides 208 and 209 in the sewing selection mechanism 200 Is replaced with 201A and 202A having arc-shaped guides 208A and 209A and the same as the sewing selection mechanism 200 except that the groove cams 203 and 204 are replaced with the groove cams 203A and 204A A detailed description thereof will be omitted.

[Patent Document 1] Japanese Patent Laid-Open Publication No. H10 (1998) -099571

[Patent Document 2] Japanese Patent Application Laid-Open No. 2007-029630

However, even if any of the above-described button moon is a sewing machine, the adjustment of the pitch of the needle pads according to the width of the buttonhole is determined at the engagement position of the feed and insertion member in the circular guide. When the engagement position is away from the swing support point of each swinging member, the pitch becomes larger, and when it becomes closer, the pitch becomes smaller. Therefore, in order to cope with a button having a large gap between the buttonholes, it is necessary to provide a large width of the engagement position. Therefore, it is necessary to adequately arrange the stroke of the circular guide of the swinging member.

However, in the button month sewing machine 200 based on Patent Document 1 shown in FIG. 11, since the arc guides 208 and 209 of the swing member 201 of the stitch selection mechanism 200 are adjacent to each other, It is not possible to sufficiently secure the stroke T of the circular-arc-shaped guide 208 of the rotary shaft 201. On the other hand, when the stroke T of the arc-shaped guide 208 of the swinging member 201 is sufficiently secured, the arc-shaped guide 208 of the swinging member 201 The stroke of the guide 209 is restricted and there is a problem that sufficient strokes of the arc-shaped guides 208 and 209 can not be secured on both of the swinging members 201 and 202.

In response to such a problem, in the button month sewing machine 200A based on Patent Document 2 shown in Fig. 12, by arranging the groove cams 203A and 204A at both ends of the shaft 205, the swinging members 201A and 202A, The button moon based on Patent Document 1 can take a larger distance than the sewing machine and the stroke of the circular guides 208A and 209A can be sufficiently secured.

However, as shown in Figs. 13 and 14, the following problem has occurred in the button sewing machine 200A based on Patent Document 2.

That is, the needle dropping order of the buttons is different in the sewing of the start position (first needle) and the end position (the 16th needle) as shown in Figs. 13A and 13B. Therefore, the grooves of the grooved cams 203A, 204A of the sewing selection mechanism 200A are positioned at the start position (16th needle) next to the end position (the 16th needle) so that the next button can be attached immediately after one button- And the button holding mechanism is moved to the position of the first needle (first needle). When the pivotal members 201A and 202A pivotally moved by the grooved cams 203A and 204A pivot from the end position (the 16th needle) to the start position (the first needle), as shown in Fig. 14, The shape guides 208A and 209A are staggered from each other. At this time, when it is desired to switch the sewing of Fig. 13 (a) and the sewing of Fig. 13 (b) with respect to the sewing of the buttonhole, the feed and sweeping member 206 is moved along the circular guides 208A and 209A The timing that can be applied is only at the timing along the same circumferential phase of the arcuate guides 208A, 209A of the swinging members 201A, 202A.

Therefore, when the stop positions of the grooved cams 203A and 204A are slightly shifted at the end and start of button closing, the arc guides 208A and 209A of the swinging members 201A and 202A are largely shifted from each other, It is impossible to transmit the signal 206. As a result, the sewing can not be surely switched.

SUMMARY OF THE INVENTION The present invention has been made in view of such problems, and it is an object of the present invention to provide a sewing machine for a button sewing machine capable of easily and reliably switching sewing by sufficiently ensuring a width of pitch adjustment according to the interval of buttonholes.

According to a first aspect of the present invention, there is provided a needle stitch forming apparatus comprising: a needle stitch forming mechanism (17, 19) for moving a sewing needle up and down at a predetermined position to form needle stitch; A pair of cams 54 and 55 for causing the button holding mechanism to perform two different kinds of feed movements and a button holding mechanism 40 for moving the button stitch forming mechanism A sewing selection mechanism (58) connected to the button holding mechanism and capable of turning operation, a stopper means (30) for stopping the sewing machine Two swinging members (56, 57) capable of causing the button holding mechanism to swing and causing the swinging movement to occur in the button holding mechanism, and an arc- Like guide members (56a, 57a) respectively formed on the swinging member and extending on the same arc so that the two arcuate guide members face each other, and by the operation of the sewing selection mechanism, Wherein the button holding mechanism is adapted to engage with one of the arcuate guide members so that the button holding mechanism moves the button mover corresponding to one of the selected cam portions to perform sewing, Wherein each cam shape is formed such that a needle falls on the same buttonhole with respect to each of the first needle and the final needle regardless of which cam is selected by the operation of the sewing selection mechanism.

According to the invention as set forth in claim 1, the hole for dropping the needle in the first needle when the button is stitched and the hole for dropping the needle in the final needle are two kinds of stitches, The direction of movement of the front end of each of the two circular guides of the two swinging members when the sewing machine is stopped after the sewing of the button is completed always coincides with each other. Therefore, the respective guides are arranged at the same position with respect to the swinging direction, and a state in which the guides are arranged along the same circumferential phase before and after the start of one buttoning, that is, Even if the stop positions of the respective guides are shifted with respect to the most suitable state to be transmitted to the guide of the guide, the ends of the guides are not shifted differently from each other and are shifted in the same direction as in the conventional case. .

Further, when the sewing selection mechanism is transmitted from one guide to the other guide, the possibility that the sewing selection mechanism collides with the other guide causes breakage of the sewing selection mechanism and each guide can be reduced, The button moon will be able to provide the sewing machine.

(Overall Configuration of Embodiment)

1 to 10, a button moon sewing machine 100 according to an embodiment of the present invention will be described below. Fig. 1 is a side view of a button sewing machine 100, which is an embodiment of the present invention, and Fig. 2 is a perspective view.

The button month sewing machine 100 includes a frame 20 for receiving or holding each configuration of the sewing machine, a sewing machine motor (not shown) serving as a driving source of each configuration, A clutch mechanism 25 for switching connection and disconnection of power transmission from the sewing machine motor to the main shaft, a vertical movement mechanism 35 for moving the sewing needle 17 up and down, and a sewing needle 17 (Not shown) having a rotary looper 19 (see Fig. 4) for cooperating to form a needle bar of a round bar, a button holding mechanism 40 for holding a sewing attachment adhered to the cloth , A moving mechanism (50) for relatively positioning the sewing needle and the sewing attachment at the time of sewing, and a needle number adjuster " stopping means " for setting the number of needles for sewing the sewing attachment (30). That is, the stop means stops the operation of the needle-paddle forming mechanism and the cam portions 54 and 55 described later on the predetermined number of needles sewing the button.

(frame)

As shown in FIGS. 1 and 2, the frame 20 is formed in a substantially 'U' shape, and includes a sewing machine bed portion 21 constituting a lower portion thereof, a first end portion 21a of the sewing machine bed portion 21, And an arm portion 23 extending from the rising body portion 22 in the same direction as the sewing machine bed portion 21. The sewing machine body portion 22 is provided with an arm portion 23 extending from the rising body portion 22 in the same direction as the sewing machine bed portion 21.

In the following description, the longitudinal direction of the sewing machine bed portion 21 is the Y axis direction, the direction in which the sewing needle 17 moves up and down orthogonal to the Y axis direction is referred to as the Z axis direction, the Y axis direction, and the Z axis Direction is orthogonal to the X-axis direction.

(Connection of each axis)

In the sewing machine bed portion 21, a main shaft is rotatably provided along the X-axis direction, and the sewing machine motor is rotationally driven through the clutch mechanism 25.

In the sewing machine bed portion 21, a looper shaft of the looper mechanism is rotatably provided along the Y axis direction, and rotational driving is performed from the main shaft to the main shaft at the constant speed through the screw gear.

In the sewing machine bed portion 21, a reduction shaft 31 of the needle number adjusting mechanism 30 is rotatably provided along the X-axis direction and attached to the end portion of the looper shaft 22 on the side of the rising body portion 22 A rotational driving force is given by a worm gear at a predetermined reduction ratio.

The interlocking shaft 34 is rotatably provided in the sewing machine bed portion 21 along the X-axis direction so as to interlock the needle-number adjusting mechanism 30 with the clutch mechanism 25.

(Needle number adjusting device)

3 shows only the needle-number adjusting mechanism 30 provided on the sewing machine bed portion 21. As shown in Fig.

As shown in the figure, the needle number adjusting mechanism 30 includes a worm gear (not shown) attached to a lapper shaft and a spur gear engaged with the worm gear, A decelerating shaft 31 and a substantially disk-shaped plate cam 32 provided at one end of the decelerating shaft 31 and a drive shaft 34 for interlocking with the clutch mechanism 25, An adjusting arm 33 fixed to the one end of the plate cam 32 and fixed to the outer periphery of the plate cam 32 at the swinging end thereof and an adjusting arm 33 for pressing the adjusting arm 33 toward the outer periphery of the plate cam 32 (Not shown).

The worm gear of the needle number adjusting mechanism 30 and the spur gear of the decelerating shaft can be exchanged with each other having a different pitch and number of teeth and thereby the reduction ratio of the reduction shaft can be adjusted. The deceleration shaft 31 is appropriately selected in accordance with the number of needles for stitching the adherend. For example, in the case where the sewing attachment is a button having four thread passing holes, and a needle having eight needles is stuck to each of the two holes, a total number of needles of 16 needles is required, so that the worm gear and the spur gear Is used.

That is, the reduction shaft 31 performs rotational driving at a reduction ratio set by selection of gears with respect to the main shaft.

The plate cam 32 is fixed to the decelerating shaft 31 and rotates together with the plate cam 32. The plate cam 32 is substantially circular in shape and has a concave portion 32a formed in a part of its outer periphery.

The adjusting arm 33 is fixedly supported on the interlocking shaft 34 and performs swinging around the interlocking shaft 34. [ The adjustment arm 33 is pivoted to the outer periphery of the plate cam 32 at the pivotal end thereof and only when the concave portion 32a of the plate cam 32 is rotated, As shown in Fig.

The concave portion 32a of the plate cam 32 is formed to count the number of needles required to sew the adherend of stitches, and the transient stop of the stroke is executed in accordance with this count. Since the decelerating shaft 31 rotates at a deceleration ratio of 16 with respect to the main shaft, it rotates once at every 16 needles, and stops moving every 16 needles. Thus, the needle-number adjusting mechanism 30 having the plate cam 32 functions as a " stopping means ".

In addition, in the above-described embodiment, in the case of sewing the above-described four-hole button sewing, when the plate cam 32 makes one round, the sewing of one button is completed, (32). The number of the concave portions 32a of the plate cam 32 is based on the relationship between the amount of rotation of the reduction shaft 31 and the number of needles for sewing the buttons and is not limited to the above- Needless to say. That is, the reduction ratio of the reduction shaft 31 may be an integral multiple of the number of needles for sewing one button, and recesses 32a may be formed at the same number of the same number as the integral multiple.

(Clutch mechanism)

As shown in Figs. 1 to 3, the clutch mechanism 25 interlocks with the needle number adjusting mechanism 30 for counting the set number of needles to switch connection and disconnection of driving force between the sewing machine motor and the main shaft, A main pulley 26 driven by a motor via a timing belt (not shown), a driven pulley 27 capable of contacting and separating from the main pulley 26, A switching lever 28 for switching the contact and separation of the driven pulley 27 and a brake lever 29 for stopping the driven pulley 27 which is turned from the contact state to the disengaged state and rotates in a detachable manner.

  The switching lever 28 and the brake lever 29 are integrally fixed to the interlocking shaft 34 and pivot about the interlocking shaft 34.

The swinging end portion of the switching lever 28 is switched to the upper position and the lower position by the swing motion around the interlocking shaft 34 so that the swinging pulley 26 is rotated in the upper position And releases the pressurized state at the lower position. As described above, the interlocking shaft 34 is connected to the adjusting arm 33, and when the adjusting arm 33 is engaged with the concave portion 32a of the plate cam 32, the switching lever 28 is moved downward And when the lever 32 is out of the concave portion 32a, the switching lever 28 is switched to the upper position.

That is, when the adjusting arm 33 is engaged with the concave portion 32a, the power transmission from the pulley 26 to the driven pulley 27 is cut off and the adjusting arm 33 is disengaged from the concave portion 32a The power transmission is performed.

The pivotal end of the brake lever 29 is vertically moved by pivoting about the interlocking shaft 34 and is pivoted so as to be brought into sliding contact with the outer peripheral surface of the driven pulley 27 by descending.

The driven pulley 27 is fixedly supported on the main shaft, and the power transmitted from the driven pulley 26 is transmitted to the main shaft through the driven pulley 27.

When the engaging portion of the driven pulley 27 for performing rotation is engaged with the leading end portion of the brake lever 29, the driven pulley 27 is engaged with the driven pulley 27 at a predetermined position on the outer periphery of the driven pulley 27, Braking works.

The switching lever 28 and the brake lever 29 described above are pivoted by the articulated actuating pedal to pivot each of the swinging end portions upward. That is, when the sewing machine motor is started, no power is transmitted to the main shaft in the state where the tip end of the adjusting arm 33 of the needle number adjusting mechanism 30 is fitted in the concave portion 32a of the plate cam 32, And the like.

Once the power is transmitted to the main shaft, the deceleration shaft starts to rotate through the looper shaft from the main shaft. Therefore, even if the foot is dropped from the starting pedal, the adjusting arm 33 is maintained in a state of missing from the recess 32a of the plate cam 32 do.

When the main shaft is rotated by the number of the set number of needles, the adjusting arm 33 is fitted to the concave portion 32a of the plate cam 32 again so that power is transmitted from the main pulley 26 to the driven pulley 27 Is cut. When the fitting engagement portion on the outer periphery of the driven pulley 27 reaches the front end portion of the brake lever 29, the driven pulley 27 is engaged with the front end portion, and the braking force acts to rotate the driven pulley 27 and the spindle The rotation is stopped.

(Needle sweat forming device)

The up-and-down moving mechanism 35 of the needle-stitch forming mechanism includes an unillustrated rod which is disposed along the up-and-down direction within the standing body 22 and whose lower end is connected to the main shaft through an eccentric cam (not shown) A needle bar 36 supported so as to be movable up and down at the front end of the arm portion 23 while holding the arm portion 23 and a swinging arm 37 swingably supported inside the arm portion 23. [

The upper end of the rod is connected to one end of the swing arm 37 and the other end of the swing arm 37 is connected to the needle bar 36 in such a state as to be able to transmit only the upward and downward displacement due to the swinging motion. Therefore, the up-and-down moving driving force of the rod that performs the up-and-down movement at the same cycle as the main axis is transmitted to the needle bar 36 through the swing arm 37, and the sewing needle 17 moves up and down in synchronization with rotation of the main shaft.

4, the needle plate 18 is omitted.

The looper mechanism of the needle-stitch forming mechanism includes the looper shaft described above and the looper 19 supported by the looper shaft at the lower side of the needle plate 18 provided on the upper end surface of the sewing machine bed portion 21. [

The looper 19 has a pointed edge for catching the sewing thread from the lowered sewing needle 17 down to the needle plate 18 and has a sharp tip for performing a full- The sewing room is caught and moved downward to stretch the loop of the sewing room downward. Then, when the end of the knife is pointed upward again and the sewing room is caught by the lowered sewing needle 17, the loop of the previous sewing room is released from the end of the knife so that the next loop is released from the loop, By repeating, single yarn loop sewing is performed.

(Button holding mechanism)

As shown in Figs. 1 and 2, the button holding mechanism 40 for holding the button extends along the Y-axis direction on the upper surface of the sewing machine bed portion 21, and its distal end part freely moves along the XY plane And is supported on the sewing machine bed.

5, the button holding mechanism 40 includes a pair of pinching claws 41, 41 extending toward the front end side, and a pair of pinching claws 41, (Not shown). When the button B is stitched, the button B is held between the pinching claws 41 and 41.

The pinching claws 41 and 41 have different structures at their tip portions depending on the type of stitching attachment (button size, etc.).

In the sewing machine 100, the button sewing machine 100 is provided with four holes, each of which has a hole at each of the four vertexes of the square, and the button holding mechanism 40 is a button holding mechanism, The button is held in the direction in which the two sides of the square which form the positions of the respective holes of the button having the four holes are parallel to the X axis direction and the other two sides are parallel to the Y axis direction .

6, an elongated hole 42a is formed in the bottom plate 42 of the button holding mechanism 40, and a fitting member 43 is engaged with the elongated hole 42a so as to be slidable. The fitting member 43 is fixed to a predetermined position of the frame 20.

The bottom plate 42 is slidably moved by the long hole 42a and the fitting member 43 by the forward and backward movement transmitted by the back and forth moving mechanism of the moving mechanism 50 to be described later, Move. The distal end portion 42b of the bottom plate 42 is formed so as to extend substantially along the X-axis direction with the shaft 43a of the shim member 43 as the rotation axis by the lateral movement transmitted by the lateral movement mechanism of the movement mechanism 50. [ Direction.

That is, the button holding mechanism 40 for holding the sewing attachment relative to the needle drop position of the sewing needle 17 moving up and down at a predetermined position relatively moves along the X-Y plane so that the button B is stitched.

(Moving mechanism)

The moving mechanism 50 includes a left and right moving mechanism for moving the button holding position of the button holding mechanism 40 substantially along the X axis direction and a button holding mechanism for moving the button holding position of the button holding mechanism 40 substantially along the Y axis direction And a front-rear moving mechanism for moving the front-

(Left-right moving mechanism)

As shown in Fig. 6, the left-right moving mechanism is provided with a left-and-right moving cam as a " cam mechanism " having a cam groove in accordance with the needle- The swinging arm 52 swinging in accordance with the shape of the cam groove of the left and right movement groove cam 51 and the bottom plate 42 of the button holding mechanism 40 by connecting the swinging arm 52 and the button holding mechanism 40, And a left and right movement transmitting member (53) for transmitting movement in a direction substantially along the X axis direction to the holding mechanism (40).

The swinging arm 52 is provided with a roller at a lower portion thereof, and the roller is pivotally supported by a conveying cam roller shaft 52a. The roller of the swinging arm 52 is engaged with the cam groove of the left and right movement cam 51. The roller reciprocates in the direction substantially along the X axis direction according to the shape of the cam groove, 52 swing almost in the direction along the X-axis direction. One end of the left and right movement transmitting member 53 is connected to the front end portion of the swinging arm 52 and the other end is connected to the bottom plate 42 of the button holding mechanism 40. The button holding mechanism 40 swings to the left and right with the shaft 43a of the fitting member 43 of the button holding mechanism 40 as the rotating shaft.

The connecting position of the other end of the left and right movement transmitting member 53 and the bottom plate 42 of the button holding mechanism 40 can be changed and adjusted so that the right and left swinging strokes can be adjusted. That is, when the bottom plate 42 and the other end of the left and right movement transmission member 53 are connected to each other at a position away from the shaft 43a of the fitting member 43, the left and right movement strokes become small, The left and right moving strokes become larger when the bottom plate 42 and the other ends of the left and right movement transmitting members 53 are connected.

The relationship between the shape of the groove formed in the left and right movement cam 51 and the movement of the button holding mechanism 40 will be described later.

(Front and rear moving mechanism)

As shown in Fig. 6, the front-rear moving mechanism includes two back-and-forth moving cams 54 and 55 as "cam portions" and "cam mechanisms" corresponding to approximately 'U' And two swing members 56 (56) swinging about swing fulcrum shafts (56d, 57d) pivotally supported on the sewing machine bed portion (21) in accordance with the shape of cam grooves formed in the two back and forth moving cams , A sewing selection mechanism (58) for selecting between a substantially U-shaped sewing operation and an 'X' manual sewing operation, and a button holding mechanism (40) And two forward and backward moving support members (59a, 59b) for supporting. The two swinging members 56 and 57 have circular guides 56a and 57a, respectively, and the distal ends of the circular guides 56a and 57a face each other.

The two back and forth moving grooves include a substantially U-shaped sewing groove cam 54 having a cam groove formed by the needle stitch formation of a substantially U-shaped sewing machine and a cam groove 54 for forming needle swabs of the 'X' And an 'X' character sewing groove cam 55 having the same shape. Therefore, the front and rear feeding cams 54 and 55 make two different kinds of feeding movements to the button holding mechanism as the cam portions. The two forward and backward movement grooves 54 and 55 and the aforesaid left and right movement groove cams 51 are all circular concentric cams fixed on the reduction shaft 31. These are all cylindrical rollers, In the X-axis direction. Since these groove cams 51, 54, 55 are fixed and coaxially supported, synchronization is achieved. That is, grooves are formed so that movement of each needle from the first needle to the final needle at the start of sewing to each needle drop position (each hole of the button) is performed simultaneously for each needle.

The forward and backward moving cams 54 and 55 and the left and right moving groove cams 51 are rotated at a reduced speed so as to make one rotation while the predetermined number of needles are being formed.

The rollers 56c and 57c are driven by the conveying cam roller shafts 56b and 57b so that the rollers 56c and 57c are rotated by the conveying cam roller shafts 56b and 57b, . The roller 56c of the swinging member 56 is engaged with the cam groove of the substantially U-shaped sewing groove cam 54 and the decelerating shaft 31 is rotated so that the substantially U- 54 and the roller 56c of the swinging member 56 swings along the cam groove of the substantially U-shaped sewing groove cam 54, the swinging end portion of the circular guide 56a is almost in the Y-axis Direction. The roller 57c of the swinging member 57 is engaged with the cam groove of the substantially U-shaped sewing groove cam 55. When the decelerating shaft 31 rotates, the 'X' When the roller 55 of the swinging member 57 rotates and the roller 57c of the swinging member 57 swings along the cam groove of the X-axis self-aligning groove cam 55, The swinging end swings almost in the direction along the Y-axis direction.

Therefore, the two swinging members 56 and 57 are engaged with one of the two cams 54 and 55 independently of each other, and pivotally driven by one cam engaged with the cam, The transferring motion can be generated.

The sewing selection mechanism 58 includes a feed-in member 58a which is movably engaged along the arc-shaped guides 56a and 57a and a feed control lever 58b which rotatably supports the fitting member. Further, the pivotal support point of the feed control lever 58b is connected to one end of the two front and rear movable support members 59a and 59b. Further, the feed adjusting lever 58b is connected to the button holding mechanism 40 via the forward / backward moving support member 59b. Thus, the stitch selection mechanism 58 has the swing support point at the other end of the back-and-forth moving support member 59a fixed at a predetermined position of the bed portion 21, and the other end of the arcuate guides 56a, And transmits the swing motion in the direction along the Y-axis direction to the button holding mechanism 40. [ The sewing selection mechanism 58 is connected to the button holding mechanism 40 so as to be rotatable.

In addition, by rotating the feed control lever 58b, the feed-in end member 58a can be rotated along the arc-shaped guides 56a and 57a. At this time, the distance between the swing-in member 58a and the swing support point shafts 56d and 57d of the swinging members 56 and 57 is changed. This causes the strokes of the forward and backward movements of the button holding mechanism 40 to be changed from the arcuate guides 56a and 57a of the pivotal members 56 and 57 to the button holding mechanism 40 via the sewing selection mechanism 58. [ In the case where the feed-in end member 58a is engaged with either one of the arc-shaped guides 56a and 57a at a position near the pivot support fulcrum shafts 56d and 57d, The forward and backward stroke is small. When the feed-in end member 58a is engaged with either one of the arc-shaped guides 56a, 57a at a position remote from the swing support point, the forward and backward stroke resulting from the swinging member having the arc- Big. That is, by rotating the feed control lever 58b, the forward and backward movement stroke can be adjusted by adjusting the engagement position of either the feed piece 58a or the circular guide 56a or 57a.

Further, by rotating the feed control lever 58b, the circular guides 56a and 57a to which the feed-in members 58a are engaged can be switched. For example, in order to perform approximately 'U' character sewing, the feed adjusting member 58b is operated to switch from the state in which the feed-in member 58a and the circular guide 56a are engaged, to the 'X' The feed-in end member 58a can be transmitted from the circular guide 56a to the circular guide 57a. Also, the opposite is also possible. Thus, the feed-in end member 58a can be switched between engagement with the circular-arc guides 56a and 57a. That is, by operating the feed adjusting lever 58b, it is possible to select the movement pattern of the button holding mechanism 40 corresponding to one of the roughly "U" character sewing and "X" character sewing.

(Approximately 'U' and 'X' needle stitch positions)

Next, the needle drop position, the left and right movement groove cam 51, the 'U' character sewing groove cam 54 and the X 'key sewing operation button' B 'for approximately' U ' And the groove shape of the self-aligning groove cam 55 will be described in detail.

Fig. 7A is an explanatory view showing the approximate 'U' character sewing of the button B, and Fig. 7B is an explanatory diagram showing the order of needle dropping of the 'X' character sewing. Reference numerals 1 to 16 in Fig. 7 represent the order of needle dropping of the sewing needles in button sewing. 8 is a graph showing the relationship between the groove shape of the left and right movement cam 51, the substantially U-shaped sewing groove cam 54, and the 'X' Fig. 8 (a) shows the groove shape of the left and right movement cam 51, FIG. 8 (b) shows the groove shape of the substantially U-shaped character string grooved cam 54, Shows a groove shape of the 'X' character sewing groove cam 55. 8 (b) and 8 (c), the shapes of the substantially U-shaped sewing groove cam 54 and the 'X' Since the extending directions of the arcuate guides 56a and 57a pivotally moved by the respective groove cams 54 and 55 are opposite to each other in the direction of movement of either one of the front and back of the button holding mechanism 40 have.

The needle drop position of the button B is determined by the moving direction of the button holding mechanism 40. [ That is, as the button holding mechanism 40 holding the button B swings by the moving mechanism 50, the button B moves relative to the needle drop position of the sewing needle so that the button B is stitched .

First, the correspondence between the left and right needle drop positions of the button B shown in Fig. 7 and the groove shapes of the left and right movement cams 51 shown in Fig. 8 (a) will be described.

As can be seen from comparison between Figs. 7A and 7B, the left and right movement of the needle drop position at the button pressing is always constant. That is, the needles of the first, third, fifth, seventh, eighth, ninth, eleventh, thirteenth, sixteenth and sixteenth needles always fall to the right side of FIG. 7 (a) 10, 12, 14 The needle always falls to the left. At this time, the left and right movement of the needle drop position depends on the groove shape of the left and right movement groove cam 51 of the left and right movement mechanism shown in Fig. 8 (a).

Next, the correspondence between the needle drop position at the back and front of the button B shown in Fig. 7 and the groove shape of the front-back moving groove cam shown in Figs. 8 (b) and 8 (c) will be described.

The forward and backward movement of the needle drop position is roughly different between "U" and "X" tail stitching. In the roughly "U" character sewing, the first to eighth needles are formed at the back of FIG. 7 (a) and (b), and the ninth to sixteenth needles are formed at the front side. 7, 8, 10, 12, and 14 needles are arranged at the back of FIGS. 7A and 7B, and the second, fourth, sixth, and ninth needles , 11, 13, 15, 16 needles are made from the front side. At this time, if the sewing attachment pattern on the button sewing is to be roughly "U" or "X" self-sewing, the feed stopper 58a of the sewing select mechanism 58 is moved by the arc- (56a, 57a). That is, when the feed-in end member 58a is engaged with the arc-shaped guide 56a, movement is performed according to the groove shape of the substantially U-shaped sewing groove cam 54 shown in FIG. 8 (b) , And when the feed-in end member 58a is engaged with the circular-arc guide 57a, movement according to the groove shape of the 'X' character-sewing groove cam 55 shown in FIG. 8 (c) is performed. 8 (b) and 8 (c), the shapes of the substantially U-shaped sewing groove cam 54 and the 'X' Since the extending directions of the arcuate guides 56a and 57a pivotally moved by the respective groove cams 54 and 55 are opposite to each other in the moving direction of either one of the front and rear of the button holding mechanism 40 .

At this time, the first needle, that is, the needle drop position at the time of starting is the right rear side, in both of the roughly "U" character sewing and "X" character sewing. In addition, the 16th needle, that is, the needle drop position at the end is the right front. That is, the start position and the end position of the needle drop position at the button closing are substantially the same in the 'U' character sewing and the 'X' character sewing.

Here, since the left and right movement of the button holding mechanism 40 is always constant, the button holding mechanism 40 is not changed in almost any of the 'U' character sewing and the 'X' character sewing. That is, the start position and the end position of the needle drop position in the button closing are substantially the same in the 'U' character sewing and the 'X' character sewing. And the direction of movement from the end of sewing of the button holding mechanism 40 formed by the groove shape of the 'X' character sewing groove cam 55 to the start of sewing are the same.

Further, as described above, since the decelerating shaft 31 is transmitted with power so as to circulate while being moved by the number of needles (16 needles) necessary for sewing the button B, The cam and the left and right movement groove cam 51 are formed with grooves for moving the entire number of needles for sewing. That is, when one button is stitched and the next button is stitched, a transition is made from the groove shape for performing movement for the sixteenth needle to the groove shape for performing the movement for the first needle to each groove cam.

Then, the needle-number adjusting mechanism 30 cuts off the power transmission from the sewing machine motor before the needle drop of the first needle of the next sewing after the needle drop of the 16th needle.

Thus, the start position and the end position of the dropping position of the button in the buttonhole are substantially the same in the 'U' character sewing and the 'X' character sewing in that the 'U' character sewing groove cam 54 and the 'X' And the swinging directions transmitted to the respective swinging members when they are shifted from the sixteenth needles to the first one by the groove shapes possessed by the respective groove cams 55 are the same.

(Swinging direction of the arc-shaped guide before and after start of button engagement)

Next, the relationship between the swinging direction of the circular guides 56a, 57a before and after the start of sewing of the button B and the selection mechanism 58 will be described in detail.

9 shows a relationship between the groove shape of the substantially U-shaped groove-moving groove cam 54 and the 'X'-letter groove groove cam 55 before and after the start of sewing of the button B and the rollers 56c and 57c of the swinging member, Fig. Fig. 10 is an explanatory view showing the positional relationship between the swinging members and the conveying-in member 58a before and after the start of sewing of the button B is started. 10 (a) shows the positional relationship of the final needle (the 16th needle) when the needle is dropped, FIG. 10 (b) shows the corresponding positional relationship And shows the corresponding positional relationship when the needle is dropped at the start (first needle).

When the above-described button closing is completed and the decelerating shaft 31 is stopped at the ideal stop position, the cam grooves 54 for approximately 'U' character sewing and the cam grooves for the 'X' The positional relationship of the pivotal members 56, 57 engaged with the respective cam grooves with the rollers 56c, 57c is in the positional relationship as shown in Fig. At this time, the centers of the rollers 56c and 57c are on the line of FIG. 9 (b) which is exactly the middle position during the switching operation of moving the button holding mechanism 40 back and forth from the needle drop of the final needle to the initial needle drop . At this time, the positional relationship of the pivotal members 56 and 57 is as shown in FIG. 10 (b), and the circular guides 56a and 57a of the pivotal members 56 and 57 are positioned on the same circumference And the trajectory of the turning shaft of the fitting member 58a supported by the feed adjusting lever 58b is set along the arcuate guides 56a and 57a at this time. Thereby, the feed-in end member 58a of the sewing selection mechanism 58 is rotated by the feed control lever 58b to be easily transmitted from one side of the arcuate guides 56a and 57a to the other side. That is, when the number of sewing needles in one button attaching is completed, the rotational force transmitted to the decelerating shaft 31 is automatically cut off by the stopping means 30, so that the substantially U-shaped sewing groove cam 54 and the U- The rotation of the 'X' self-aligning groove cam 55 is stopped and the positional relationship between the swinging members 56 and 57 becomes as shown in FIG. 10 (b), so that the operation of the stitching selection mechanism 58 becomes easy.

The center of the rollers 56c and 57c in the final position (the 16th needle) of needle dropping in the buttoning is on the line of Fig. 9 (a), and the positional relationship of the swinging members 56 and 57 at this time As shown in Fig. 10 (a). The center of the rollers 56c and 57c is on the line of FIG. 9 (c) in the start position (first needle) of needle dropping at the next button press after the above-mentioned button closing is completed, The positional relationship of the members 56 and 57 becomes as shown in Fig. 10 (c). That is, the swinging direction of the swinging members 56 and 57, which is performed from the completion of swinging one button to the start of the next swinging of the buttons, is substantially the same in the direction along the Y-axis direction. At this time, the distal ends of the arcuate guides 56a, 57a of the swinging members 56, 57 are always on the same line substantially in the direction along the X-axis direction. Thus, even when the swinging members 56 and 57 are positioned at the positions of FIGS. 10A and 10C, the conveying member 58a can be easily conveyed from one side of the arcuate guides 56a and 57a to the other side .

That is, the rollers 56c and 57c, which are originally centered on the line shown in FIG. 9 (b), are shifted from each other at the stop position at the time of deceleration for some reason, the distal ends of the arcuate guides 56a, 57a of the swinging member 56, 57 are always positioned substantially in the same direction along the X-axis direction It is on board. Accordingly, even when the stop positions of the substantially U-shaped and U-shaped grooved cam 54 and the 'X' self-sewing grooved cam 55 after the end of button closing are shifted, It is possible to easily switch the forward and backward movement of the drive shaft 40.

(Explanation of operation of button sewing machine)

The operation of the button sewing machine 100 having such a configuration will be described. First, when the button B is stitched as a sewing attachment, the button holding mechanism 40 is attached to the upper surface of the sewing machine bed portion 21, and a button is held between the pair of pinching claws 41 And a cloth C to be sewn is set between the button holding mechanism 40 and the needle plate 12. [ At this time, the feed control lever 58b of the sewing selection mechanism 58 is operated to determine whether to perform approximately 'U' character sewing or 'X' character sewing. For example, when roughly performing the U-letter tailing operation, the feed adjusting member 58b is operated so that the feed-in end member 58a is engaged with the arc-shaped guide 56a.

The connection position of the left and right movement transmission member 53 and the bottom plate 42 and the position of the sewing selection mechanism 58 are adjusted in accordance with the stroke of the button hole of the button B, The left and right movement and the back and forth movement strokes of the button holding mechanism 40 optimal for the hole are set.

Subsequently, when the sewing machine motor starts to be driven and the trigger pedal is depressed, the adjusting arm 33 is pulled out of the erect portion 32a of the plate cam 32, and by the rotation of the interlocking shaft 34, 28 and the brake lever 29 are rotated upward to transmit rotational power to the main shaft, the loupe shaft, and the reduction shaft 31. Thus, the button B performs a predetermined movement to make the stroke, and the looper 13 forms the needle stitches in order.

Thereafter, the adjusting arm 33 is fitted into the concave portion 32a of the plate cam 32, and by this rotation of the interlocking shaft 34, the switching lever 28 and the brake lever 29 are moved downward And the rotational power is cut to the main shaft, the looper shaft, and the reduction shaft 31. [ Then, when the driven pulley 27 that rotates inertially rotates to the fitting engagement portion, rotation is restrained by the brake lever 29.

On the other hand, while the driving force of the reciprocating rotation operation is transmitted from the main shaft to the movable knife of the well-known thread cutting mechanism (not shown) by the rotation of the interlocking shaft 34 and the driven pulley 27, One end of the loop of the final needle is cut, and the sewing work for one button is completed. In the case of performing the sewing work for the next button, the sewing cloth C of the button B is separated from the sewing machine 100, and then the sewing button and cloth are set.

At this time, when the stroke of the buttonhole changes due to the change of the type of the button or the like, the connection position between the left and right movement transmitting member 53 and the bottom plate 42 is adjusted as described above, And adjusts the forward and backward strokes of the button holding mechanism 40 by operating the sewing selection mechanism 58. [ Thus, it is possible to set the amount of movement of the button holding mechanism 40 that is optimal for the stroke of the buttonhole.

Further, when switching between the roughly U-letter sewing and the X-letter sewing, the sewing selection mechanism 58 is operated so that the feed-in piece 58a is moved from one of the arc-shaped guides 56a and 57a Lt; / RTI > For example, when switching from roughly "U" character string sewing to "X" character sewing, the feed adjusting lever 58b is moved so as to transmit the feed-in end member 58a from the circular- .

Thereafter, the sewing of the buttons is performed in the same order as described above by pressing the start pedal again.

(Operation and effect of the button sewing machine according to the above-described embodiment)

According to the above-described embodiment, since the first needle and the final needle of the needle drop at the time of sewing the button are the same buttonholes in both the "U" and "X" The swinging end portions of the circular guides 56a and 57a of the two swinging members 56 and 57 are moved in the same direction until the sewing machine 100 is stopped until the sewing machine 100 stops, Can be arranged in the same position with respect to the swinging direction. Thereby, the state in which the arcuate guides 56a and 57a are arranged along the same circumferential phase before and after the start of one button engagement, that is, the state in which the sewing selection mechanism 58 is moved from the one arcuate guide 56a or 57a to the other Even if the stop positions of the arcuate guides 56a and 57a are shifted relative to the most suitable state to be transmitted to the arcuate guides 57a and 56a of the arcuate guides 56a and 57a, The deviation between the arcuate guides 56a and 57a can be reduced and the sewing selection mechanism 58 can be more easily transmitted. This makes it possible to provide a more effective button sewing machine that can always smoothly perform the switching operation.

When the sewing selection mechanism 58 is transmitted from the one circular arc guide 56a or 57a to the other circular arc guide 56a or 57a, the feed slider 58a is moved to the other circular arc guide 56a Or 57a so that the possibility of breakage of the sewing selection mechanism 58 and the arcuate guides 56a and 57a can be reduced, thereby making it possible to provide a sewing machine with higher reliability.

(Etc)

In addition, the positions where the 'U' character sewing groove cam 54 and the 'X' character sewing groove cam 55 are provided may be replaced with each other. In this case, the groove shape formed in each of the groove cams 54, 55 is determined by the arrangement positions of the groove cams 54, 55 and the swinging members 56, 57 pivotally moved by the groove cams 54, 55 U ' and ' X ' self-tailoring are accurately performed by the respective grooves on the basis of the relationship between back and forth movement caused by the button retaining mechanism 40. [

Further, in the above-described embodiment, two left and right moving cams are provided, and two back and forth moving cams are provided for roughly "U" and "X" It is also possible to provide two corresponding cams for the 'U' character stitching and 'X' character stitching, and the front and rear moving cams may be one. In this case, the arrangement of the back-and-forth movement groove cam and the left and right movement groove cams is interchanged so that the swinging members 56 and 57 are engaged with the respective left and right movement grooves, The sewing selection mechanism 58 which is engaged with the first and second elastic members 56a and 57a is configured to be capable of changing the displacement in the Y axis direction into the displacement in the X axis direction through the bell crank, . The front and rear moving groove cam is engaged with the swinging arm 52 and the movement transmitting member 53 connected to the swinging arm 52 is moved in the Y-axis direction to convert the displacement in the X- And is connected to the bottom plate 42 of the button holding mechanism 40 through a crank or the like.

In this case, the needle drop of each sewing is made in the order of the state shown in Figs. 7 (a) and 7 (b) in the state of being rotated clockwise or counterclockwise The groove of the cam is formed so as to correspond to the order of the sewing.

Further, the embodiments may take other embodiments without departing from the features of the present invention. For example, the groove cam may be replaced with a plate cam.

1 is a side view of a sewing machine 100 according to an embodiment of the present invention.

2 is a perspective view of a button sewing machine 100 according to an embodiment of the present invention.

Fig. 3 is an enlarged perspective view of the button moon seen from the opposite side of Fig. 2 with respect to the X-axis direction of the sewing machine 100. Fig.

4 is a side view showing the relationship between the sewing needle 17 and the looper 19 provided below the needle plate 18. Fig.

5 is a perspective view showing the distal end side of the button holding mechanism 40. Fig.

Fig. 6 is a perspective view showing the configuration of the button holding mechanism 40 and the moving mechanism 50 provided in the frame 20. Fig.

Fig. 7 is an explanatory view showing the order of the needle dropping of approximately 'U' and 'X' character stitching on the button B, wherein (a) (B) is a view showing the order of needle dropping in the 'X' character sewing.

8 is a graph showing the relationship between the groove shape of the left and right movement cam 51, the substantially U-shaped sewing groove cam 54, and the 'X' (A) is a view showing the groove shape of the left and right movement groove cams 51, (b) is a view showing a groove shape of the 'U' character sewing groove cam 54, and c) shows a groove shape of the 'X' character sewing groove cam 55. FIG.

9 shows a relationship between the groove shape of the substantially U-shaped groove-moving groove cam 54 and the 'X'-letter groove groove cam 55 before and after the start of sewing of the button B and the rollers 56c and 57c of the swinging member, Fig.

10A and 10B are explanatory diagrams showing the positional relationship between the pivotal members and the conveying member 58a before and after the start of sewing of the button B, (B) is a diagram showing a positional relationship before (at the time of) ending of button closing, (c) is a diagram showing a corresponding positional relationship at the time of needle dropping to be.

11 is a top view showing a part of the structure of a conventional sewing selection mechanism based on Patent Document 1;

12 is a top view showing a part of the structure of the transfer control function of the prior art based on Patent Document 2. [

FIG. 13 is an explanatory view showing the order of needle dropping in the conventional 'U' character sewing and 'X' character sewing, FIG. 13 (a) (b) is a view showing the order of needle dropping in the 'X' character sewing.

Fig. 14 is an explanatory view showing the swinging direction of the arc guides 208A, 209A of the conveying mechanism 200A shown in Fig.

Description of the Related Art [0002]

17: sewing needle 19: looper

25: clutch mechanism 30: needle number adjusting mechanism

31: Deceleration axis 32: Plate cam

33: adjusting arm 34: interlocking shaft

35: Needle stick forming device 40: Button holding device

41: pinching claw 42: bottom plate

43: shim member (50): moving means

51: left and right movement cam 52: pivot arm

54: approximately U-shaped groove cam (cam portion)

55: Groove cam (cam portion) for sewing 'X' character 56, 57:

56a, 57a: an arc-shaped guide

Claims (1)

A needle sweat forming mechanism for moving the sewing needle up and down at a predetermined position to form a needle sweat, A button holding mechanism for moving the sewing needle in a horizontal direction with respect to a vertical moving position of the sewing needle while holding the button, Two cam portions for causing the button holding mechanism to perform two different kinds of feed movements, Stop means for stopping the operation of the needle-paddle forming mechanism and the cam portions in a predetermined number of needles sewing the button, A sewing selection mechanism connected to the button holding mechanism and capable of rotating operation, Two swinging members which are engaged with one of the two cam portions independently of each other and are capable of generating a transferring motion to the button holding mechanism by pivotally moving with respect to the cam portion to be engaged, And an arcuate guide member formed in an arc shape along a pivotal path of the stitch selection mechanism and provided in each of the pivotal members, And the sewing selection mechanism is switched so as to be engaged with one of the arcuate guide members by the operation of the sewing selection mechanism so that the two arcuate guide members are extended on the same arc so as to face each other, A button sewing machine for performing button-changing sewing in which a mechanism moves in correspondence with either selected cam portion, The both cam portions drop the needle into the same buttonhole with respect to each of the first needle and the final needle regardless of the cam selected by the operation of the sewing selection mechanism and when the transition from the final needle to the first needle Characterized in that each cam shape is formed so that the swinging direction transmitted to the swinging member is the same.

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