KR20070049577A - Chain-stitch sewing machine - Google Patents

Abstract

An object of the present invention is to be able to easily switch whether or not to execute a solid knot.

MEANS TO SOLVE THE PROBLEM In order to solve the said subject, this invention has the sewing needle 11, the rotary looper, the knot cam 32 which has the cam part 61, and the contact part 71 which abuts with a cam part, and has a shaft by the said contact. A rocking means 70 oscillating around the member 62 and a thread holding member 63 for making a firm knot, wherein the rocking means 70 switches to switch the running position and the non-running position of the knot. The operation member 73 is provided, and it is comprised so that selection of execution of a knot may be selected by switching of each position. Moreover, the elastic body 75 which keeps the said switching operation member in each position by the pressing force was provided.

Description

Round Bar Sewing Machine {CHAIN-STITCH SEWING MACHINE}

1 is a side view of a round bar sewing machine according to a first embodiment of the present invention.

2 is a perspective view of a round bar sewing machine.

3 is a perspective view of a part of the round bar sewing machine omitted.

4 is a perspective view of the round bar sewing machine seen in the arrow F direction of FIG.

5 is an enlarged view of the needle number adjusting mechanism and the knot mechanism, and is an operation explanatory diagram showing a state in which the switching operation member is switched to the execution position.

6 is an enlarged view of the needle number adjusting mechanism and the knot mechanism, and is an operation explanatory diagram showing a state in which the switching operation member is switched to the non-executing position.

Fig. 7A is a perspective view showing the main part of the button holding means, and Fig. 7B is a perspective view showing the main part of the label holding means.

8 is an exploded perspective view of the knot mechanism.

FIG. 9A is a front view illustrating a knot forming process, and FIG. 9B is a perspective view.

FIG. 10A is a front view illustrating a process of forming a knot following FIG. 9, and FIG. 10B is a perspective view.

FIG. 11A is a front view illustrating a process of forming a knot following FIG. 10, and FIG. 11B is a perspective view.

FIG. 12A is a front view illustrating a process of forming a knot following FIG. 11, and FIG. 12B is a perspective view.

FIG. 13A is a front view illustrating a process of forming a knot following FIG. 12, and FIG. 13B is a perspective view.

FIG. 14A is a front view illustrating a process of forming a knot following FIG. 13, and FIG. 14B is a perspective view.

FIG. 15A is a front view illustrating a process of forming a knot following FIG. 14, and FIG. 15B is a perspective view.

FIG. 16A is a front view illustrating a process of forming a knot following FIG. 15, and FIG. 16B is a perspective view.

FIG. 17A is a front view illustrating a process of forming a knot following FIG. 16, and FIG. 17B is a perspective view.

18 is a front view showing a state where a knot is formed.

Fig. 19 is a perspective view of another rocking means in the second embodiment.

20 is an exploded perspective view of the rocking means according to the second embodiment.

21 is a diagram for explaining a switching operation of the swinging means in the second embodiment.

Fig. 22 is a perspective view of the swinging means in the third embodiment.

Fig. 23 is an exploded perspective view of the swinging means in the third embodiment.

FIG. 24 is a diagram for explaining a switching operation of the rocking means in the third embodiment. FIG.

Fig. 25 is a front view of the swinging means in the fourth embodiment.

Fig. 26 is an exploded perspective view of the swinging means in the fourth embodiment.

It is a perspective view of the principal part of the knot mechanism in 5th Embodiment.

It is an exploded perspective view of the principal part of the knot mechanism in 5th Embodiment.

FIG. 29 is a cross-sectional view taken along the line V-V of FIG. 28 and a cross-sectional view taken along the line W-W of FIG.

It is a figure for demonstrating the switching operation of the switching means of a knot mechanism in 5th Embodiment.

It is a perspective view of the principal part of the knot mechanism in 6th Embodiment.

It is an exploded perspective view of the principal part of the knot mechanism in 6th Embodiment.

33 is a view for explaining that the switching means of the knot mechanism in the sixth embodiment is switched to the execution position.

34 is a diagram for explaining the switching operation of the knot mechanism in the sixth embodiment to the non-execution position.

It is a perspective view of the principal part of the knot mechanism in 7th Embodiment.

Fig. 36 is an exploded perspective view of the switching means included in the knot mechanism in the seventh embodiment.

Fig. 37 is a view for explaining the switching operation of the switching means included in the knot mechanism in the seventh embodiment.

Fig. 38 is an exploded perspective view showing the main part of the switching means in the eighth embodiment.

39 is an enlarged perspective view of main parts of the switching means according to the eighth embodiment.

Fig. 40 is a view for explaining the switching operation during knotting of the switching means in the eighth embodiment.

Fig. 41 is a view for explaining the switching operation when the knot is not executed by the switching means in the eighth embodiment.

Fig. 42 is an exploded perspective view showing the main part of the switching means in the ninth embodiment.

Fig. 43 is a view for explaining the switching operation during the knotting of the switching means in the ninth embodiment.

FIG. 44 is a view for explaining a switching operation during knotting of the switching means in the ninth embodiment. FIG.

FIG. 45 is a view for explaining a switching operation when the knot is not executed by the switching means in the ninth embodiment. FIG.

Fig. 46 is a view for explaining the switching operation when the knot is not executed by the switching means in the ninth embodiment.

Explanation of symbols on the main parts of the drawings

11: sewing needle 12: needle plate

13: looper 14: thread escape member

20: frame 30: needle number adjustment mechanism

31: reduction shaft 32: plate cam (knot cam)

Knot Mechanism: 60, 60D, 60E, 60F, 60G

61, 61F: cam member (cam part) 62: shaft member

63: seal holding member 64, 64E: connecting means

70, 70A, 70B, 70C: rocking means (switching means) 70D, 70E: rocking means

71, 71A, 71B, 71C, 71D, 71E: Contact

72, 72A, 72B, 72C, 72D, 72E: Connecting operating member

73, 73A, 73B, 73C, 81D, 81E, 81F, 81G, 81H: Switching operation member

74, 74A, 74B, 74C: locking means

72a: first coupling protrusion 72b: second coupling protrusion

73a: first coupling recess 73b: second coupling recess

75, 75A, 75B, 75C, 82D, 82E, 82F: Pressure spring (elastic material)

80D, 80E, 80F, 80G, 80H: switching means

83A, 84A, 83C, 84C, 83D, 84D, 83E, 84E, 83F, 84F: Coupling hole

83G, 84G: opening 83H, 84H: first holding part

85A, 85C, 85D, 86D, 85E, 86E, 85F, 86F: Slit

100: round sewing machine B: button (sewing attachment)

L: Label (Sewing Attachment)

The present invention relates to a round bar sewing machine for attaching a sewing object to a sewing object.

In general, the round bar sewing machine, unlike the LOCK STITCH, because only the thread passed through the needle to form needle stitches like the nose of knitting, once the needle stitches are released, the needle stitches around them are released. For example, in a sewing machine with a round bar button for attaching a button to a fabric with a round bar, a sewing needle that moves up and down, a holding mechanism for holding the fabric and the button and reciprocating from side to side or back and forth, and from each sewing needle under the needle plate A looper for capturing the sewing thread is provided.

Then, the needle and the cloth are reciprocated in a predetermined direction with respect to the sewing needle moving in the fall, alternately dropping the needle into the two threaded through holes of the button, and the loop of the sewing thread for each needle drop, and the loop of the sewing thread for the next needle drop. The button attachment by the single yarn round bar has been made to pass through.

However, in the single yarn round bar, the entire sewing thread is released immediately after the end of the sewing thread is released, so that the sewing attachment is separated from the sewing object, so that the needle is repeatedly dropped at the same position during the final needle drop and the needle drop before the needle. In general, the end of the sewing thread is tightly tied to form a knot. However, in this knotting method, there is still a problem that the end of the sewing thread is tightly inserted through the loop formed at the needle fall before the needle drop from the last needle drop, and thus loosened when the end of the sewing thread is removed from the loop.

For this reason, the thread length is kept long so that the loop by the needle drop from the last needle before the two needles is not fastened by the thread take-up, and the release is released before the loop by the needle drop from the last needle is fastened by the thread take-up, Two needles from the last needle together with a loop by thread take-up by the needle falling one needle from the last needle and a loop formed by the fall of the last needle by the loop by the last needle being pulled downward by the looper It is known to knot the former loop from the last needle to the inside of the loop before one needle.

In the knot by this knotting method, since the loop before one needle from the last needle fastens the loop before two needles from the last needle, and the loop before two needles from the last needle fastens the thread end after cutting, the thread end after diarrhea cutting Even if it is pulled out of the loop before the needle, the loop before one needle can be held in a fastened state, thereby making a knot which is not easily released.

In order to perform the knot, the conventional round bar sewing machine rotates in contact with the engaging cam of the plate cam provided on the rotating shaft which rotates one revolution with the number of needles required for attachment of the sewing object, and the rotating plate cam. And a knot member which is rotatably supported at the lower side of the needle plate and which loops the sewing thread at its distal end, and a plurality of link bodies connecting the arm and the knot member (see Patent Document 1, for example).

The knot member is capable of moving from its evacuation position away from the sewing thread to the thread holding position by which the knot member hangs the loop of the sewing thread and maintains the length of the thread longer than the state engaged by the thread take-up.

The plate cam has an engaging protrusion that contacts the arm at a timing after the loop of the needle drop from the last needle to the looper is captured by the looper, and the loop due to the needle drop from the needle before the last needle is unwound. It is formed so that the contact state with an arm may be released in the timing before fastening.

In the plurality of link members connecting the arm and the knot member, the distal end portion of the knot member is in an evacuation position when the arm and the plate cam are not engaged, and the distal end portion of the knot member is engaged when the arm and the plate cam are engaged. The connection is made so that the thread holding position is maintained.

By such a configuration, the conventional round bar sewing machine, the engaging projection of the plate cam is coupled to the arm to advance the front end of the knot member to the thread holding position before the loop by the needle drop before the two needles is fastened by the thread take-up, The engaging projection of the plate cam is released from engagement with the arm and the tip of the knot member is retracted to the evacuation position before the loop by the needle drop before the final needle is fastened by the thread take-up.

Thereby, the knot which is not easily loosened as mentioned above is performed.

[Patent Document 1] Japanese Patent Laid-Open No. H9 (1997) -290081

The conventional round bar sewing machine described above is not limited to attaching a button, but is also used for attaching a label, for example. Since these labels are often removed from the fabric after their role, it is preferable to attach them with knots which are easily loosened as in the prior art rather than the knots which are not easily loosened.

However, in the conventional round bar sewing machine, in order to easily loosen the knot, it is necessary to separate the protruding members constituting the engaging projection screwed to the plate cam so that the knot member is not rotated. The drawback was that the conversion was very complicated.

In addition, since the arrangement of the protruding members greatly influences the timing of rotation of the knot members, accurate repositioning is required for the reattachment work, which makes the switching method of the knot method more complicated.

An object of the present invention is to enable a switch operation between a knot that is not easily loosened and a knot that is easily loosened, and to facilitate the operation.

Moreover, it aims at making the structure for the switching into a simple structure.

The invention according to claim 1 is a sewing needle (11) moving in motion, a rotary looper (13) which cooperates with the sewing needle to form needle stitches of a round bar, a knot cam (32) having a cam portion, and the knot cam. Rocking means having contact portions 71, 71A, 71B, 71C, 70D, 70E in contact with the cam portion, the rocking means being pivotally supported about the shaft member by contacting the contact portion with the cam portion, and a rocking portion of the rocking means; And a thread holding member 63 connected to and reciprocating to hold a first loop formed by needle drop two needles before the final needle, the thread holding member being the first loop at its thread holding position. The thread length of the needle is kept longer than the normal needle stitch, and upon falling of the final needle, the second loop after the first loop is moved from the thread holding position to release the first loop before the first loop approaches the object to be sewn. A round bar sewing machine for forming a knot by passing the first loop through a second loop together with a third loop formed by the falling of the final needle, wherein the thread switching member switches the execution of the knot and the non-execution. Means 70, 70A, 70B, 70C, wherein the switching means includes: switching operation members 73, 73A, 73B for switching the execution and the non-execution of the knot by switching the position between the execution position and the non-execution position; 73C, 81D, 81E, 81F, 81G, 81H) and elastic bodies 75, 75A, 75B, 75C, 82D, 82E, 82F which hold the switching operation member by the pressing force in the running position or the non-running position. The switching operation member is adapted to switch between the execution position and the non-execution position against the elastic force so that the knot formation can be selected.

The invention as set forth in claim 2 has the same configuration as the invention as set forth in claim 1, and the switching operation members 73 and 73A for switching the execution and the non-execution of the knot by switching the position between the execution position and the non-execution position. 73B, 73C, 81D, 81E, 81F, 81G, 81H) and an elastic body 75, 75A, 75B, 75C, 82D, 82E, 82F that holds the switching operation member in the running position or the non-running position by the pressing force. And switching the switching operation member between the execution position and the non-execution position against the elastic force so as to select whether or not to execute the knot formation.

The invention as set forth in claim 3 has the same configuration as the invention as set forth in claim 2, and at the same time, the switching means includes a connection operating member (72, 72A, 72B, 72C, 72D, 72E) that swings around the shaft member. And the switching operation member having the contact portion, and the switching operation member are fitted with respect to the connection operation member in the non-execution position where the contact portion cannot contact the execution position where the contact portion may contact the cam portion. The configuration in which the locking means 74, 74A, 74B, 74C for fixing are provided is adopted.

Invention of Claim 4 has the structure similar to invention of Claim 2, and the cam part of the said knot cam is comprised so that position adjustment is possible along the outer periphery of the said knot cam.

The invention according to claim 5 has the same configuration as the invention according to claim 2, and the switching means includes: the switching operation member is configured to allow the cam portion to emerge from the outer circumferential surface of the knot cam. A configuration is adopted so that switching between the execution position to oscillate and the non-operation position to oscillate the oscillation means is possible.

(Overall constitution of the first embodiment)

Hereinafter, the round bar sewing machine 100 which concerns on 1st Embodiment of this invention is demonstrated based on FIG. 1 is a side view of a round bar sewing machine 100, Figure 2 is a perspective view, Figure 3 is a perspective view of a part omitted.

The round bar sewing machine 100 includes a frame 20 for storing or maintaining each component of the sewing machine, a sewing machine motor (not shown) serving as a driving source of each component, and a main shaft for transmitting output torque from the sewing machine motor ( (Not shown), a clutch mechanism 25 for switching connection and disconnection of power transmission from the sewing machine motor to the main shaft, a needle shank mechanism 35 for moving the sewing needle 11, and a sewing needle 11; A looper mechanism (not shown) having a rotary looper 13 (see Fig. 9) which cooperates to form needle stitches of the round bar, and a thread escaping member which avoids the loop of the sewing thread formed by the looper 13 from descending the sewing needle ( 14 (see FIG. 9), retaining means 40 (45) for holding the sewing attachment to be attached to the cloth to be sewn, and a moving mechanism 50 for relatively positioning the sewing needle and the sewing attachment during sewing; Required for attachment of sewing attachments A needle number adjusting mechanism 30 for setting the number of needles, a knot mechanism 60 for knotting after sewing, and a thread cutter tool (not shown) for cutting the thread after knotting are provided.

(frame)

As shown in Figs. 1 and 2, the frame 20 is generally formed in a substantially “co” shape, and the sewing machine bed portion 21 and the sewing machine bed portion 21 constituting the lower portion thereof are formed. The vertical body part 22 standing up from one end part and the arm part 23 extended from the vertical body part 22 in the same direction as the sewing machine bed part 21 are provided.

In addition, in the following description, the longitudinal direction of the sewing machine bed portion 21 is the Y-axis direction, orthogonal to the Y-axis direction, the direction in which the sewing needle 11 is moved in the Z-axis direction, and the Y-axis direction and A direction orthogonal to the Z axis direction is referred to as the X axis direction.

(Connection of each axis)

In the sewing machine bed portion 21, a main shaft is rotatably installed along the X-axis direction, and rotational driving is performed from the sewing machine motor through the clutch mechanism.

In addition, a looper shaft of the looper mechanism is rotatably installed in the sewing machine bed portion along the Y-axis direction, and rotational driving is performed at the same speed as the main shaft through the screw gear from the main shaft.

In addition, in the sewing machine bed portion, the needle number adjusting mechanism 30 is rotatably installed along the X-axis direction, and predetermined by a worm gear attached to the end portion of the vertical body portion 22 side of the looper shaft. The rotational driving force is given by the reduction ratio of.

In the sewing machine bed portion, an interlocking shaft 34 for interlocking the needle control mechanism 30 to the clutch mechanism along the X-axis direction is rotatably provided.

(Needle number adjustment mechanism)

4 is a perspective view of the round bar sewing machine 100 viewed from the arrow F direction of FIG. 3, and illustrates only the needle number adjusting mechanism 30 and the knot mechanism 60 installed in the sewing machine bed 21. 5 and 6 are enlarged perspective views of the needle control mechanism 30 and the knot mechanism 60.

As shown in these figures, the needle count adjustment mechanism 30 includes a worm gear (not shown) attached to the looper shaft, and a spur gear engaged with the worm gear, and which rotates at a predetermined reduction ratio with respect to the main shaft. Interlocking shaft for interlocking with the reduction shaft 31 mentioned above, the substantially disc-shaped plate cam 32 (refer FIG. 4 thru | or 7) provided in the one end part of the reduction shaft 31, and the clutch mechanism 25. FIG. (34), an adjustment arm (33) at which the base end is fixed to one end of the linkage shaft (34) and the swing end is coupled to the outer circumference of the plate cam (32), and the adjustment arm (33) is a plate cam ( A spring (not shown) is urged toward the outer circumference of 32.

The worm gear of the needle control mechanism 30 and the spur gear of the reduction shaft can be exchanged with a separate pitch and the number of teeth, thereby adjusting the reduction ratio of the reduction shaft. The reduction shaft 31 is suitably selected according to the number of needles for attaching a sewing attachment. For example, when the sewing attachment is a button having four thread through holes, and the attachment is performed with 12 needles for every two holes, the gear ratio and the gear ratio are 24, since the reduction ratio is 24 needles. Is used. Similarly, when the sewing attachment is a label and the attachment is made with 10 needles, a worm gear and a spur gear having a reduction ratio of 10 are used.

That is, the reduction shaft 31 is driven to rotate at the reduction ratio set by the selection of the gear with respect to the main shaft.

The plate cam 32 is fixedly held on the reduction shaft 31, rotates together, and is substantially circular in shape, and a recess 32a is formed in a part of the outer circumference thereof.

The adjustment arm 33 is fixedly supported by the interlocking shaft 34 and swings about the interlocking shaft 34. Moreover, the adjustment arm 33 is the center side of the plate cam 32 only when the swing end is pressed against the outer periphery of the plate cam 32, and when the recessed part 32a of the rotating plate cam 32 reaches | attains. Rocking towards

The recessed part 32a of the plate cam 32 is formed in order to count the series of needle numbers required for attachment of a sewing material, and according to this count, temporary stop of needle movement, thread cutting, a knot, etc. are performed. do.

For example, in the case of attaching the four-hole button described above, since two thread cuttings are made, the recesses 32a are formed at both ends of the outer circumference of the plate cam 32 in the radial direction. In the case of the label, since only one cutting of the thread is made, only one recess 32a is formed.

(Clutch mechanism)

As shown in Figs. 1 to 3, the clutch mechanism 25 is connected to the needle number adjusting mechanism 30 that counts the set number of needles, and switches the connection and disconnection of the driving force between the sewing machine motor and the main shaft. The main pulley 26 which is driven to rotate through a timing belt (not shown) by a motor, the driven pulley 27 which can contact and isolate | separate with respect to the main pulley 26, and the driven pulley 27 by the front-end | tip part rocking up and down. ), A switching lever 28 for switching contact and separation of the < RTI ID = 0.0 >) < / RTI > and a brake lever 29 for restraining the driven pulley 27, which is switched from the contact state to the separation state and rotates inertia.

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

The switching lever 28 has its swing end switched between the upper position and the lower position by swinging about the interlocking shaft 34, and the driven pulley 26 moves the main pulley 26 at the upper position (shown). Press to the side and release the pressurization from the lower position. As described above, the linkage shaft 34 is connected to the adjustment arm 33, and when the adjustment arm 33 is engaged with the recess 32a of the plate cam 32, the shift lever 28 is lowered. Switch, and the switch lever 28 is switched to the upper position when it is out of the recess 32a.

That is, power transmission from the coarse pulley to the driven pulley is interrupted when the adjusting arm 33 is coupled to the recess 32a, and power transmission is made when the adjusting arm 33 is out of the recess 32a. It is meant to be built.

The brake lever 29 is axially supported so that the swing end thereof is moved by the swing around the interlocking shaft 34 so as to slide in contact with the outer circumferential 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 main pulley 26 is transmitted to the main shaft through the driven pulley 27.

In addition, a fitting portion is formed at a predetermined position on the outer circumference of the driven pulley 27. When the fitting portion of the driven pulley 27 that rotates is engaged with the distal end portion of the brake lever 29, braking is applied to the driven pulley 27. Works.

In addition, the above-mentioned switching lever 28 and the brake lever 29 are rocking-operated with each swing end part upward by the artificially operated starting pedal. That is, at the time of starting the sewing machine motor, power is not transmitted to the main shaft in the state where the distal end portion of the adjustment arm 33 of the needle control mechanism 30 is fitted into the recessed portion 32a of the plate cam 32. By artificially performing the delivery.

Once power is transmitted to the main shaft, the reduction shaft also starts to rotate from the main shaft through the looper shaft, so that the adjustment arm 33 is out of the recess 32a of the plate cam 32 even when the foot is removed from the starting pedal. Is maintained.

Then, when the main shaft rotates by the set number of needles, the adjustment arm 33 is fitted into the recess 32a of the plate cam 32 again, so that power transmission from the main pulley 26 to the driven pulley 27 is prevented. Disconnected. Then, the driven pulley 27 is inertia rotation, when the engaging portion in the outer circumference of the brake lever 29 reaches the tip portion, while engaging with the tip portion, the braking force is applied to the inertia rotation of the driven pulley 27 and the main shaft Is stopped.

(Shanghai East Organization)

The needle shank moving mechanism 35 is installed vertically in the vertical body portion 22 and at the same time maintains a rod (not shown) and a sewing needle 11 connected to the lower end of the main shaft via an eccentric cam, and at the same time an arm portion ( 23 is provided with a needle bar 36 supported so as to be movable at the distal end portion thereof, and a swinging arm 37 supported by the inside of the arm portion 23 so as to be able to swing.

The upper end of the rod is connected to one end of the swinging arm 37, and the other end of the swinging arm 37 is connected to the needle bar 36 in such a state that only the displacement of the swing movement due to the swinging can be transmitted. Therefore, the shank-dong driving force of the rod moving in the same cycle as the main shaft through the eccentric cam is transmitted to the needle bar 36 through the swing arm 37, and the sewing needle 11 is moved in synchronism with the rotation of the main shaft. .

(Looper mechanism and seal escape member)

The looper mechanism is provided with the above-mentioned looper shaft and the looper 13 supported by the looper shaft at the lower side of the needle plate 12 provided on the upper end surface of the sewing machine bed portion 21.

The looper 13 has a pointed part for capturing the sewing thread from the sewing needle 11 lowered to the lower side of the needle plate 12, and the pointed end part which performs the circumferential movement of the full rotation by the looper shaft is located above. When the sewing thread is picked up and moved downward, the loop of the sewing thread is pulled downward. Then, when the pointed end is upwards again and the sewing thread is captured from the lowered sewing needle 11, the next loop is passed through the loop by releasing the loop of the previous sewing thread from the pointed end, and by repeating this. Perform a single round bar.

The thread escaping member 14 is provided between the needle plate 12 and the looper 13 and is moved by two cams provided on the looper shaft so as to draw a triangular trajectory for each needle movement, and thus the looper shaft 13 ) The loop of the sewing thread captured by) is moved so as not to interfere with the sewing needle which descends by the next needle movement.

(Maintenance means)

As shown in Figs. 1 and 2, the holding means 40 (45) for holding the sewing attachment extends along the Y-axis direction from the upper surface of the sewing machine bed portion 21, and the tip end thereof is XY plane. It is supported on the sewing machine bed 21 to be freely movable along.

In addition, as shown in FIG. 7, the holding means 40 (45) is used in which the structure of the front-end | tip part differs according to the kind of sewing material.

That is, when the button B is used as a sewing attachment, as shown in Fig. 7A, a pair of clamping claws 41 and 41 and the clamping claws 41 extending toward the tip side are shown. , A holding means 40 having a spring (not shown) for pressing 41 in the direction of approaching each other is used. The button B is held in the state sandwiched between the respective fitting claws 41 and 41.

In addition, in the case where the label L is a sewing material, as shown in Fig. 7B, the plate-shaped frame 46 extending toward the tip side and the label provided on the inner side of the frame are fixed. A holding means 45 having a locking claw 47 is used.

(Moving mechanism)

As shown in Fig. 3, the moving mechanism 50 includes a front and rear movement groove cam (not shown) fixed to the reduction shaft 31 and a left and right movement groove cam (fixed and supported on the reduction shaft 31). And a forward and backward movement transmission mechanism 51 for imparting a movement force in the Y-axis direction to the bottom plate 42 of the retaining means 40 through a pin coupled to the cam groove of the front and rear movement groove cam. The transmission mechanism 52 for right and left movement which imparts a movement force in the X-axis direction to the bottom plate 42 of the holding means 40 via the pin which is coupled to the cam groove of the groove cam is provided.

The front and rear movement groove cams and the left and right movement groove cams each have a disc shape and grooves are formed in the circumferential surface thereof. Each groove is coupled in a state where pins of the respective transmission mechanisms are inserted, respectively, and each cam is rotated by the reduction shaft, thereby imparting displacement in the X-axis direction according to the groove shape for each pin.

The forward / backward movement transmission mechanism 51 is mainly composed of a rotation arm or a link body axially supported by the sewing machine bed portion 21, and the movement displacement in the X-axis direction that the pin receives from the forward / backward movement home cam is shifted in the Y-axis direction. Converted to and delivered to the holding means (40 (45)).

In addition, the left and right movement transmission mechanism 52 is also mainly composed of a rotating arm or a link body axially supported by the sewing machine bed 21, the holding means 40 to maintain the displacement in the X axis direction that the pin receives from the left and right movement groove cams. (45)).

That is, the movement mechanism 50 determines the movement position of the holding means 40 (45) with respect to the X-axis direction and the Y-axis direction for every needle movement according to the groove shape of each cam, and accordingly the holding means 40 (45)) to fall to the sewing needle 11 to the predetermined position of the sewing attachment held.

In addition, as described above, since the power transmission is performed so that the reduction shaft rotates once during the needle movement required by the number of needles required for attachment of the sewing attachment, the front and rear movement home cams and the left and right movement groove cams are required for sewing attachment. Grooves are formed to allow the movement of all needles.

In addition, when the needle moves in different needle movements or when the number of needles required for sewing is different, the cam grooves are adapted to be replaced with different moving groove cams.

(Thread cutter tool)

The thread cutting mechanism transmits the power of the cutting operation of the movable mass 15 from the spindle and the fixed mass 16 and the movable scalpel 15 (see FIG. 17) provided between the needle plate 12 and the looper 13. And a switching means for switching the connection and disconnection of power transmission by the transmission means.

The switching means is movable from the main shaft using the rotation of the interlocking shaft 34 when the adjustment arm 33 of the needle adjustment mechanism 30 is fitted into the recess 32a of the plate cam 32. After the power transmission to (15) is connected, and the adjusting arm 33 is fitted into the recess 32a of the plate cam 32, the driven pulley 27 is inerted to be restrained by the brake lever 29. The movable scalpel 15 is reciprocated by a driving force of about one rotation of the main shaft until it is cut at the end of the sewing thread.

(Knot mechanism)

8 is an exploded perspective view of the knot mechanism 60.

As shown in FIGS. 4-6 and 8, the knot mechanism 60 is the plate cam 32 as a knot cam which has the cam member 61 as a cam part, and the contact part 71 which abuts on the cam member 61. As shown in FIG. Oscillation means 70 which is pivotally supported about the shaft member 62 by contact between the contact portion 71 and the cam member 61, and a reciprocating rotation under the needle plate 12. It is possible to be supported, and at the same time, the yarn holding member 63 for holding the first loop formed by the needle drop before the two needles from the last needle by the rotation, and the rocking portion and the yarn holding member 63 of the rocking means 70. It is provided with a connecting means 64 for connecting.

The swinging means 70 functions as a switching means for switching the execution and non-execution of the knot by the thread holding member 63.

The seal holding member 63 has a structure substantially the same as the member described as "knot plate 75" in the description of the invention in Japanese Patent Laid-Open No. H9-290081, and the same during sewing. It is a member which performs the same operation | movement by timing, and shows the same effect.

That is, the thread holding member 63 is provided between the needle plate 12 and each of the scalpels 15 and 16 of the thread cutting tool (see Figs. 17A and 17B), and the base end thereof is a sewing machine. It is pivotally supported on the bed and is connected to the swinging means 70 to hold a first loop formed by needle drop two needles before the final needle.

The rotating end is capable of capturing the sewing thread by rotation in one direction (referred to as 'forward rotation'), and has a claw shape capable of releasing the sewing thread by rotation in the opposite direction (referred to as 'reverse rotation'). The rotational trajectory of the rotational end is arranged to pass in the vicinity of the Shanghai-dong path of the sewing needle. Further, the position where the sewing thread can be captured by the forward rotation is set as the thread holding position of the thread holding member 63.

The plate cam 32 of the needle number adjustment mechanism 30 described above also has a function as a knot cam for reciprocating the thread holding member 63 at a predetermined timing. That is, the plate cam 32 is a circular external cam fixed to the reduction shaft 31, and the cam member 61 which has the protrusion which protruded toward the radially outer side is attached.

Further, the concave portion 32a of the plate cam 32 described above is formed in an arrangement capable of engaging with the adjustment arm 33 and not engaging with the contact portion 71 of the swinging means 70, and the cam member 61. The projection of is formed in an arrangement capable of engaging with the contact portion 71 and not with the adjustment arm (33).

And all the plate cams 32 contact the contact part 71 along the circular outer periphery which becomes equidistant from the reduction shaft 31 except the protrusion part of the cam member 61. As shown in FIG.

The cam member 61 is screwed to the plate cam 32 through an arc-shaped long hole, and is attached so that the movement position can be determined along the outer periphery of the plate cam 32 by screw operation. As a result, the contact timing (angle of the reduction shaft) between the cam member 61 and the contact portion 71 can be adjusted when the cam plate 32 is rotated.

The connecting means 64 is composed of a plurality of link bodies for connecting the swinging means 70 and the seal holding member 63.

That is, one end of the connecting means 64 is connected to a portion to be rocked by the contact between the cam member 61 and the contact portion 71 in the rocking means 70, and the other end is the thread holding member 63. Is connected near the support shaft.

Then, the connecting means 64 rotates the seal holding member 63 in the forward rotation direction when the cam member 61 is rotated in the direction in which the cam member 61 presses the contact portion 71 by the rotation of the plate cam 32, When the cam member 61 passes through the contact portion 71 by the rotation of the plate cam 32 and rotates in the direction in which the contact portion 71 returns to its original position, the seal holding member 63 moves in the retraction rotation direction. In order to rotate, the connection between the rocking means 70 and the thread holding member 63 is aimed at.

The swinging means 70 has a connecting operation member 72 oscillating around the shaft member 62 and a contact portion 71 and at the same time overlaps the connecting member 72 with the connecting operation member 72. It is provided between the switching operation member 73 oscillating around the center and the two operation members 72 and 73, and the switching operation member 73 has an execution position where the contact portion 71 can contact the cam member 61. An elastic force is applied to the locking fixing means 74 for clamping and locking the connection operating member 72 in a non-running position where contact is impossible, and the state of being locked in the running position or the non-running position of the switching operating member 73 by an elastic force. A pressure spring 75 as an elastic body to hold is provided.

That is, in the execution position, the cam member 61 is brought into contact with the contact portion 71, so that the connecting operation member 72 and the switching operating member 73 swing at the time of the contact, so that the connecting means 64 The knot can be executed by forwardly rotating the thread retaining member 63. In the non-execution position, the cam member 61 cannot be brought into contact with the contact portion 71, so that the thread retaining member 63 is not oscillated at all. You can do it so that you do not run the knot.

The connection operation member 72 is axially supported by the shaft member 62 along the X-axis direction, and is disposed adjacent to the plate cam 32 at the side of the sewing machine bed portion 21.

The connecting operation member 72 is connected to one end of the above-described connecting means 64 at the swinging portion away from the shaft member 62.

In addition, the connection operation member 72 has first and second engaging projections 72a and 72b constituting a part of the locking fastening means 74. In addition, the connection operation member 72 is connected to the connection operation member 72 in a rotational direction in which the contact portion 71 of the switching operation member 73 connected to the connection operation member 72 is pressed against the outer circumference of the plate cam 32. The tension spring 76 which attaches () is attached.

The switching operation member 73 is axially supported by the shaft member 62 in a state where it is superimposed on the connection operation member 72 and has a contact portion 71. In addition, the switching operation member 73 is provided with first and second coupling recesses 73a and 73b having a substantially 'co' shape forming a part of the locking fixing means 74.

Each of the coupling recesses 73a and 73b is open toward the coupling operating member 72, and any one coupling recess 73a or 73b is formed by overlapping the switching operating member 73 with the coupling operating member 72. ) Can be fitted to any one coupling convex portion (72a, 72b). Further, in the state in which any one of the coupling recesses 73a and 73b and one of the coupling protrusions 72a and 72b are fitted, the switching operation member 73 and the connection operation member 72 rotate integrally. can do.

In the state where the first engagement convex portion 72a is fitted to the first engagement concave portion 73a, as shown in FIG. 5, the contact portion 71 of the connection operation member 73 is the plate cam 32. In a state in which it is in contact with the outer circumference of the position (execution position), and the second engaging projection 72b is fitted to the second engaging recess 73b, as shown in FIG. The first engagement projections 72a, the second engagement projections 72b, and the first engagement such that the contact portion 71 moves away from the plate cam 32 so that the cam member 61 does not reach (non-execution position). The relative arrangement of the recess 73a and the second engaging recess 73b is set.

In addition, as described above, although the tensioning member 76 which press-contacts the contact part 71 to the outer periphery of the plate cam 32 is attached to the connection operation member 72, the said switching operation member 73 implements. In the state located in the position, the stopper (not shown) which does not rotate the contact part 71 more than predetermined distance inward (reduction-axis side) more than the outer periphery of the plate cam 32 is provided. As a result, in the non-executive position, the contact portion 71 can be maintained at a position where it does not touch the tip of the cam member 61.

Moreover, the switching actuation member 73 is provided with the pressurizing spring 75 which presses to the connection operation member 72 side. Accordingly, the coupling recess 73a or 73b of the switch operating member 73 can be fitted to the coupling convex portion 72a or 72b of the linkage operating member 72.

When switching between the execution position and the non-execution position, the switching operation member 73 is moved away from the connection operation member 72 against the pressure spring 75 by manual operation, and the rotation is performed to change the position. By doing so, it is fitted by the pressing spring 75, and the state is maintained.

(Explanation of operation of round bar sewing machine)

The operation of the round bar sewing machine 100 made of the above configuration will be described. First, in the case of attaching the button B as the sewing attachment, the holding means 40 is mounted on the upper surface of the sewing machine bed portion 21, and the button is sandwiched between the pair of clamping claws 41. , Between the holding means 40 and the needle plate 12 sets a cloth (C) to be sewn.

In addition, since the solid knot is executed, the switching operation member 73 is tensioned against the pressure spring 75, and the first coupling recess 73a is positioned on the first coupling protrusion 72a to connect the operation member. It returns to (72) side. As a result, the contact portion 71 of the linkage operation member 73 is in the execution position, and abuts against the outer circumference of the plate cam 32.

Subsequently, when the drive of the sewing machine motor is started and the starting pedal is pressed, the adjustment arm 33 is separated from the recess 32a of the plate cam 32, and the changeover lever 34 rotates accordingly. 28 and the brake lever 29 rotate upwards, and rotational power is transmitted to the main shaft, the looper shaft, and the reduction shaft 31. Therefore, the needle B is made by the predetermined movement of the button B, and the stitches are sequentially formed by the looper 13.

Then, the sewing needle 11 is sewn on the needle dropping position (button hole on the right side in the drawing) one needle before the final needle from the state in which the sewing needle 11 is raised (Fig. 9) after the needle falls two needles before the last needle of the set number of needles. When the needle 11 is positioned, the cam member 61 of the plate cam 32 rotating in the direction of the arrow abuts against the contact portion 71 to rotate the swinging means 70, and through the connecting means 64 The holding member 63 is rotated forward. Accordingly, as shown in Fig. 10, the loop L1 (referred to as the first loop L1) formed by the needle drop before the two needles from the last needle is caught by the tip of the thread holding member 63, and the well-known thread The loop is secured to a constant length even when drawn to the cloth side by swelling (not shown).

Then, when the needle falls from the last needle one needle before, the looper 13 picks up the sewing thread L, and the thread escaping member 14 is moved from one side of the thread holding member 63 to the lower side (in the drawing). To the left, the first loop L1 formed by the needle drop two needles from the last needle is approached, and the thread holding member 63 holds the first loop L1 at a predetermined position (Fig. 11). L) is bent so that the length of the yarn forming the first loop L1 is kept longer than the normal needle stitches. Then, the sewing needle 11 is raised, the thread escape member 14 is moved away from the loop (L1), the looper 13 captures the sewing thread (L) and passes through the first loop (L1) than the final needle. A loop L2 (referred to as the second loop L2) formed by the needle drop before one needle is formed, the first loop L1 is separated from the looper 13, and the sewing needle 11 is raised (Fig. 12).

Here, when the last needle starts to fall to the same buttonhole as the needle drop buttonhole before one needle, the seal evacuation member 14 approaches the second loop L2 to one side (left side in the drawing), and the looper 13 ) Captures the sewing thread L (FIG. 13).

Next, when the looper 13 starts to pass the sewing thread L through the second loop L2, the thread escaping member 14 moves away from the second loop L2 (Fig. 14). Thereafter, the seal holding member 63 is released before the second loop L2 is pulled to the cloth C. FIG. As a result, a loop L3 (referred to as a third loop L3) formed by falling of the final needle passing through the second loop L2 is formed (FIG. 15).

In addition, the sewing needle 11 is raised, and the third loop L3 is pulled down (Fig. 16). At this time, as mentioned above, since the 2nd loop L2 is formed in the state which the yarn holding member 63 picked up one thread of the 1st loop L1, and bent the yarn, the 2nd loop ( The yarn length of the portion L2 is kept longer than before, and the first loop L1 can be pulled together with the third loop L3 and passed through the second loop L2 (Fig. 17).

When the third loop L3 is pulled down as described above, and the third loop L3 is cut by the movable scalpel 15 and the fixed scalpel 16, the knot portion formed by the first loop L1 becomes the second loop ( It is possible to form a rigid knot fastened by the knot portion formed by L2) (FIG. 18).

Thereafter, the adjustment arm 33 is fitted into the recess 32a of the plate cam 32, and the shift lever 28 and the brake lever 29 move downward by the rotation of the interlocking shaft 34. Rotating power is transmitted to the main shaft, the looper shaft, and the reduction shaft 31 by rotation. Then, when the inertia driven driven pulley 27 rotates to the fitting portion, rotation is stopped by the brake lever 29.

On the other hand, by the rotation of the interlocking shaft 34, the driving force of the reciprocating rotational motion is transmitted from the main shaft to the movable scalpel 15 of the thread cutting tool, and the final needle until the inertia rotating driven pulley 27 is restrained. One end of the loop is cut, and the sewing attaching operation is finished.

In addition, in the case of attaching the label L as the sewing attachment, the retaining means 45 is mounted on the upper surface of the sewing machine bed portion 21, and the label is provided on the lower side of the locking fastening claw 47 inside the frame 46. (L) is disposed, and the cloth to be sewn is set between the holding means 45 and the needle plate 12.

Since the firm knot is not performed when the label is attached, the shifting operation member 73 is tensioned against the pressure spring 75, and the second engagement recess 73b is positioned on the second engagement protrusion 72b. To the connecting operation member 72 side. As a result, the contact portion 71 of the linkage operation member 73 becomes the non-execution position and is spaced apart from the outer circumference of the plate cam 32.

The subsequent sewing machine operation is the same as the case with the button. However, since the contact portion 71 of the connection operating member 73 is set to the non-executing position, the rotation of the thread holding member 63 does not always occur, and the loop before two needles is drawn into the loop before one needle. Without, the knots that are easily loosened are executed and the sewing operation ends after the thread is cut.

(Effect of 1st Embodiment)

The round bar sewing machine 100, by the knot mechanism 60, when switching between the firm knot and the execution of the normal knot, the switching operation member 73 against the elastic force of the pressing spring 75 and the running position and Since only a simple operation of switching between non-executing positions is required, the switching operation can be performed remarkably easily and quickly.

In addition, since replacement of parts is unnecessary, there is no need to fine-tune the assembly position of the parts every time the knot is switched, so that the switching operation can be performed more remarkably and quickly.

Thereby, even when the sewing attachment in the sewing attachment operation is changed between the button B and the label L, the above-described switching operation can be performed, thereby achieving a drastic improvement in the work efficiency.

In addition, since the position of the cam member 61 that influences the operation timing of the thread holding member 63 can be adjusted, even if the needle movement is made at a high speed, the thread holding member 63 is operated at an appropriate operation timing to make a knot. You can run it.

(Etc)

In addition, the plate cam 32 of the needle control mechanism 30 and the knot cam of the knot mechanism 60 are intended to be common to the same member, but these may be individual cams fixed to the interlocking shaft 34. good.

(2nd embodiment)

As the second embodiment, similarly to the rocking means 70 described above, an example of another rocking means 70A functioning as a switching means capable of easily switching whether or not a firm knot is executed will be described based on FIGS. 19 to 21. do. FIG. 19 is a perspective view of the swinging means 70A, FIG. 20 is an exploded perspective view, and FIG. 21 is an explanatory view of the switching operation. In addition, the differences from the round bar sewing machine 100 will be mainly described, and the same components as the round bar sewing machine 100 will be given the same reference numerals and will not be repeated.

The swinging means 70A includes a connection actuating member 72A oscillating around the shaft member 62, a switching actuating member 73A having a contact portion 71A, and two actuating members 72A, 73A. Locking fixing means for fastening the switching actuating member 73A to the connecting actuating member 72A in a non-acting position where the contact portion 71A is not in contact with the acting position capable of contacting the cam member 61, 74A) and a pressurizing spring 75A as an elastic body for holding by a resilient force a state of being locked in the running position or non-running position of the switching operation member 73A.

The connection operation member 72A is axially supported by the shaft member 62 along the X-axis direction at its central portion, and is disposed adjacent to the plate cam 32 at the side of the sewing machine bed portion 21.

The connection operating member 72A is connected to one end of the above-described connecting means 64 at the swinging portion 81A away from the shaft member 62.

Moreover, the said connection operation member 72A has the extension part 82A formed in the plate cam 32 side, and the extension part 82A has a part of the locking fastening means 74A side by side in the extension direction. The 1st and 2nd engagement hole parts 83A and 84A which comprise are formed in the state which penetrated. The engaging hole portions 83A and 84A have the same inner diameter and are connected by a slit portion 85A having a smaller width than the inner diameter.

In addition, the connection operation member 72A has a connection operation member 72A in a rotational direction in which the contact portion 71A of the switching operation member 73A connected to the connection operation member 72A is in pressure contact with the outer circumference of the plate cam 32. There is attached a tension spring (not shown).

In addition, a stopper (not shown) which does not rotate the contact portion 71A inward (deceleration side) more than the outer circumference of the plate cam 32 in the state where the switching operation member 73A is located at the execution position is provided. It is installed. As a result, in the non-executive position, the contact portion 71A can be maintained at a position where it does not touch the tip of the cam member 61.

The switching operating member 73A has a shaft portion 91A and head portions 92A and 93A having a larger diameter than the shaft portion 91A fixedly mounted to both ends of the shaft portion 91A. Then, in the state where the shaft portion 91A is inserted into the engaging hole portion 83A or 84A described above and inserted into the pressure spring 75A and the sleeve-shaped contact portion 71A toward the head portion 93A side, the switching operation member 73A is attached to the connection operating member 72A.

That is, between the head portions 92A and 93A, the switching operation member 73A is connected to the connection operation member (A) with the extension portion 82A, the press spring 75A, and the contact portion 71A of the connection operation member 72A. 72A).

The outer diameter of the shaft portion 91A is larger than the width of the slit portion 85A and is set to a size that can be inserted into the engagement hole portions 83A and 84A.

Further, in the middle of the shaft portion 91A and in the vicinity of the head portion 92A, a small diameter portion 94A constituting a part of the locking fastening means 74A is formed. The outer diameter of the small diameter portion 94A is set smaller than the width of the slit portion 85A, and the width of the small diameter portion 92A is set wider than the plate thickness of the connection operating member 72A.

With this configuration, the switching operation member 73A is in a state where the head portion 92A is press-contacted to the connection operation member 72A by the pressure spring 75A in a state where it is mounted on the connection operation member 72A. The state located in either of the engagement hole portions 83A or 84A is maintained.

As shown in FIG. 21, the head portion 92A is pulled apart from the coupling actuating member 72A against the pressure spring 75A by manual operation, and the small diameter portion 94A of the shaft portion 91A is pulled out. Is inserted into the slit portion 85A, and the switching operation member 73A can be moved between the engagement hole portions 83A and 84A.

In addition, when the switching operation member 73A is positioned in the engagement hole 83A, the engagement hole 83A is positioned so that the contact portion 71A becomes an execution position in contact with the outer circumference of the plate cam 32. .

Further, when the switching operation member 73A is positioned at the engagement hole 84A, the engagement hole 84A is in a non-executive position where the contact portion 71A does not touch the cam member 61 of the plate cam 32. Location setting is made.

By such a configuration, the rocking means 70A can exhibit almost the same effect as the rocking means 70.

(Third embodiment)

As a third embodiment, similarly to the rocking means 70 described above, an example of another rocking means 70B functioning as a switching means capable of easily switching whether or not a solid knot is executed will be described based on FIGS. 22 to 24. do. FIG. 22 is a perspective view of the swinging means 70B, FIG. 23 is an exploded perspective view, and FIG. 24 is an explanatory view of the switching operation. In addition, the differences from the round bar sewing machine 100 will be mainly described, and the same components as the round bar sewing machine 100 will be given the same reference numerals and will not be repeated.

The swinging means 70B is provided between a connecting operating member 72B swinging about the shaft member 62, a switching operating member 73B having a contact portion 71B, and two operating members 72B, 73B. Locking fixing means for fastening the switching actuating member 73B to the actuating position where the contact portion 71B is in contact with the cam member 61 against the actuating position where the contacting portion 71B is not in contact with the connecting actuating member 72B. 74B) and a pressure spring 75B serving as an elastic body for holding by a spring force the state in which the switching actuating member 73B is locked to the running position or the non-running position by the elastic force.

The connection operation member 72B is axially supported by the shaft member 62 along the X-axis direction at the center thereof, and is disposed adjacent to the plate cam 32 at the side of the sewing machine bed portion 21.

The connecting operation member 72B is connected to one end of the above-described connecting means 64 at the swinging portion 81B away from the shaft member 62.

In addition, the connection operation member (72B) has an extension portion (82B) formed toward the plate cam 32, the front end portion of the extension portion (82B) is formed in the state that the coupling hole (83B) is penetrated, In the inner circumferential surface of the hole portion 83B, a groove portion 84B is formed from the side surface to the rear surface of the connecting operation member 72B. Further, at one end side of the coupling hole 83B (the front side of the coupling operation member 72B), the recessed portion has the same width as the groove portion 84B and does not reach the rear surface of the coupling operation member 72B. 85B is formed.

In addition, in the connection operation member 72B, the connection operation member 72B in the rotational direction in which the contact portion 71B of the switching operation member 73B connected to the connection operation member 72B is pressed against the outer circumference of the plate cam 32. There is attached a tension spring (not shown).

In addition, a stopper (not shown) which does not rotate the contact portion 71B inward (deceleration axis side) more than the outer periphery of the plate cam 32 in the state where the switch operating member 73B is located at the execution position is provided. It is installed. As a result, in the non-running position, the contact portion 71B can be maintained at a position where the tip of the cam member 61 does not touch the tip.

The switching operation member 73B has a shaft portion 91B and head portions 92B and 93B having a larger diameter than the shaft portion 91B fixedly mounted at both ends of the shaft portion 91B. Then, in the state where the shaft portion 91B is inserted into the coupling hole portion 83B described above and inserted into the pressure spring 75B and the sleeve-shaped contact portion 71B toward the head portion 93B side, the switching operation member 73B. Is attached to the connecting operation member 72B.

That is, between the head portions 92B and 93B, the switching operation member 73B is connected to the connection operation member (with the extension portion 82B, the pressure spring 75B, and the contact portion 71B of the connection operation member 72B inserted). 72B).

The outer diameter of the shaft portion 91B is set to a size that can be inserted into the engagement hole portion 83B.

Moreover, the rail-shaped convex part 94B is formed in the outer peripheral surface of the shaft part 91B from the side end part of the head part 92B to the longitudinal intermediate position of the shaft part 91B.

The width of the convex portion 94B is set to be narrower than that of the groove portion 84B. When the shaft portion 91B is inserted into the engaging hole portion 83B, the convex portion 94B is caused to slide in the groove portion 84B. It is supposed to be.

That is, the locking fastening means 74B is comprised of the above-mentioned engaging hole part 83B, the groove part 84B, the recessed part 85B, and the convex part 94B.

With this configuration, the switching operation member 73B is connected to the coupling operation member 72B with the shaft portion 91B inserted into the engaging hole portion 83B and the convex portion 94B inserted into the groove portion 84B. ), The state in which the head portion 92B is pressed against the connection operating member 72B by the pressure spring 75B is maintained. That is, as shown in FIG. 22, the shaft part 91B is inserted in deepest, and the contact part 71B is the state located farthest from the extension part 82B.

Then, the head portion 92B is pulled apart from the connection actuating member 72B against the pressure spring 75B, and the shaft portion 91B is rotated to rotate the tip portion of the convex portion 94B to the recess portion 85. When inserted, as shown in Fig. 24, the shaft portion 91B is inserted only shallowly, so that the contact portion 71B can be switched to the state most approached from the extension portion 82B.

In addition, when the shaft portion 91B is inserted to the deepest and the contact portion 71B is located farthest from the extension portion 82B, the shaft portion (B) is positioned so that the contact portion 71B becomes an execution position in contact with the outer circumference of the plate cam 32. 91B) is set.

In addition, when the shaft portion 91B is inserted only to a shallow position, the contact portion 71B does not touch from the cam member 61 of the plate cam 32 when the contact portion 71B is in the position most approached from the extension portion 82B. The length of the convex part 94B is set so that it may become a non-execution position.

With this configuration, the rocking means 70B can exhibit almost the same effect as the rocking means 70.

(4th Embodiment)

As a fourth embodiment, similarly to the rocking means 70 described above, an example of another rocking means 70C functioning as a switching means capable of easily switching whether or not a solid knot is executed will be described based on FIGS. 25 to 26. do. 25 is a front view of the rocking means 70C, and FIG. 26 is an exploded perspective view. In addition, the differences from the round bar sewing machine 100 will be mainly described, and the same components as the round bar sewing machine 100 will be given the same reference numerals and description thereof will be omitted.

The swinging means 70C has the coupling operation member 72C oscillating around the shaft member 62 and the contact portion 71C, and the shaft member 62 is moved in the state overlapped with the connection operation member 72C. 73C between the switching operation member which swings about the center, and two operation members 72C and 73C, and the switching operation member 73C has the execution position which the contact part 71C can contact the cam member 61, and An elastic force is applied to the locking fixing means 74C for clamping and locking the connection operating member 72C in the non-running position where contact is impossible, and the state of being locked in the running position or the non-running position of the switching operating member 73C by the elastic force. A pressure spring 75C as an elastic body to be held is provided.

The connection operation member 72C is axially supported by the shaft member 62 along the X-axis direction at the center portion thereof, and is disposed adjacent to the plate cam 32 at the side of the sewing machine bed portion 21.

The connection operating member 72C is connected to one end of the above-described connecting means 64 at the swinging portion 81C away from the shaft member 62.

In addition, the connection operation member 72C is formed in a state where the first and second engagement hole portions 83C and 84C constituting a part of the locking fastening means 74C penetrate. The slit portions 85C having the same inner diameter as the engaging hole portions 83C and 84C and having a width smaller than the inner diameter of the engaging hole portions 83C and 84C formed along the arc direction centering on the shaft member 62. Is connected.

In addition, the connection operation member 72C has a connection operation member 72C in a rotational direction in which the contact portion 71C of the switching operation member 73C connected to the connection operation member 72C is pressed against the outer circumference of the plate cam 32. The tension spring 76C which attaches () is attached.

In addition, a stopper (not shown) which does not rotate the contact portion 71C inward (deceleration side) more than the outer circumference of the plate cam 32 in the state where the switching operation member 73C is located at the execution position is provided. It is installed. As a result, in the non-executive position, the contact portion 71C can be held at a position where the tip of the cam member 61 does not touch the tip.

The switching actuating member 73C is axially supported by the shaft member 62 in a state of being superimposed on the connecting actuating member 72C, and has a round bar-shaped contact portion 71C. The contact portion 71C is located away from the shaft member 62, and at the same time, the plate is set in a state where the switching operation member 73C is switched to the execution position with respect to the connection operation member 72C by the locking fastening means 74C. It is arrange | positioned so that the outer periphery of the cam 32 can contact.

The locking fastening means 74C is switched through the first and second engagement hole portions 83C and 84C and the slit portion 85C having the same diameter provided in the connection operating member 72C through the stepped screw 87C. A switching knob 86C that is supported by the operating member 73C and which can be selectively inserted into the first engaging hole 83C and the second engaging hole 84C is provided.

The switch knob 86C has a cylindrical shape, one end of which is formed to have a smaller diameter than the other, and the other end thereof has a diameter so as to be easily gripped at the time of insertion and removal of the engaging holes 83C and 84C. It is largely formed. One end of the switching knob 86C is set to an outer diameter of a size that can be inserted into the engaging holes 83C and 84C and cannot be inserted into the slit portion 85C.

The above-mentioned press spring 75C is accommodated inside the switch knob 86C, and the stepped screw 87C passes through the center of the press spring 75C and the switch knob 86C. This stepped screw 87C is fixed to the screw hole 77C of the switching actuating member 73C at its distal end, and is held in a state in which the pressure spring 75C is compressed. Then, by the compression of the pressing spring 75C, the switch knob 86C is biased in the direction to be inserted into the engaging hole portions 83C and 84C.

The locking fastening means 74C is held by the elasticity of the pressing spring 75C so that the switching knob 86C is inserted into either of the coupling hole portions 83C or 84C, and the connection operating member 72C is held. And the switching operation member 73C can be rotated around the shaft member 62.

In addition, when the switching knob 86C is pulled out against the pressure spring 75C while the switching knob 86C is inserted into any one of the coupling hole 83C or 84C, the inner stepped screw 87C Is set to an outer diameter that can pass through the slit portion 85C, so that the switching handle 86C is moved between the engaging hole portions 83C and 84C through the slit portion 85C, and the switching operation member 73C. You can move while connected.

On the other hand, in the first engagement hole 83C, when the adjustment knob 86C is inserted, the execution position where the contact portion 71C held by the switching operation member 73C abuts against the outer circumference of the plate cam 32 (Fig. 25). Position). By this positioning, when the contact portion 71C comes into contact with the cam member 61 by the rotation of the plate cam 32, the connection operation member 72C and the switching operation member 73C rotate at the same time. The knot can be executed by moving the 63 to the thread holding position.

Also, in the second engaging hole portion 84C, when the adjustment knob 86C is inserted, the non-executing position where the contact portion 71C held by the switching operation member 73C is far from the outer circumference of the plate cam 32 (Fig. 25). The solid line position). By this positioning, even when the plate cam 32 is rotated, the cam member 61 does not touch the contact portion 71C, and the connection actuating member 72C and the switching actuating member 73C do not rotate, so that the knot is not executed. You can do that.

With the above structure, in the swinging means 70C, the switching knob 86C is inserted into either of the engaging hole portions 83C or 84C by the elasticity of the pressing spring 75C of the locking fixing means 74C. The holding state can be maintained, and the knot can be kept in a running state or a non-running state. The switching hole 86C is pulled out of the engaging hole portion 83C or 84C against the elastic force of the pressing spring 75C, and the engaging hole portion is held at the same time. By moving between 83C and 84C and selectively inserting, it is possible to switch between setting the knot and not performing the knot.

By such a configuration, the rocking means 70C can exhibit almost the same effect as the rocking means 70.

(5th Embodiment)

As a fifth embodiment, an example of another knot mechanism 60D will be described based on FIGS. 27 to 30. FIG. 27 is a perspective view showing the main part of the knot mechanism 60D, FIG. 28 is an exploded perspective view, FIG. 29 is a sectional view taken along the line VV of FIG. 28, and FIG. 30 is a view of the switching means 80D provided by the other knot mechanism 60D. It is a figure for demonstrating switching operation. In addition, the differences from the round bar sewing machine 100 will be mainly described, and the same components as the round bar sewing machine 100 will be given the same reference numerals and redundant description will be omitted.

In the knot mechanism 60D, a switching means 80D is provided between the swinging means 70D and the connecting means 64 for switching the execution of the knot by the thread holding member 63 and the non-execution. .

That is, the knot mechanism 60D has the plate cam 32 which has the cam member 61, and the contact part 71D which abuts on the cam member 61, and the said contact part 71D and the cam member 61 are matched. The rocking means 70D pivotally supported around the shaft member 62 by contact with the shaft member 62 is reciprocally supported below the needle plate 12, and the needle falls before the two needles from the last needle by rotation. To the thread holding member 63 holding the first loop formed by the first loop, the connecting means 64 connecting the rocking portion of the rocking means 70D and the thread holding member 63, and the thread holding member 63. And switching means 80D for switching between execution and non-execution of the knot.

First, the rocking means 70D has a contacting portion 71D which is in contact with the cam member 61, and a linking operation member 72D oscillating around the shaft member 62, and the linking operation member 72D. The contact portion 71D has a tension spring 76D that adds the connection actuating member 72D in the rotational direction in pressure contact with the outer circumference of the plate cam 32.

The connection operation member 72D is axially supported by the shaft member 62 along the X-axis direction at the center portion thereof, and is disposed adjacent to the plate cam 32 at the side of the sewing machine bed portion 21.

The connection operation member 72D is connected to one end of the above-described connection means 64 through the switching means 80D at the rocking portion 73D formed by bending away from the shaft member 62 along the X-axis direction. .

In addition, the linking operation member 72D is connected to the tension spring 76D at another swinging portion 74D away from the shaft member 62, in the direction in which the contact portion 71D is pressed against the outer circumference of the plate cam 32. It is added to the meeting.

Moreover, when the contact part 71D contacts the cam member 61 by the rotation operation of the plate cam 32, it rotates to the direction opposite to the pressing direction of the tension spring 76D.

The switching means 80D is connected to a switching operation member 81D for switching the connection and disconnection between the swinging portion 73D of the connection operating member 72D and one end of the connecting means 64 by a position switching operation. A first engagement hole portion for holding the switching operating member 81D in an execution position capable of transmitting the reciprocating motion in the Y-axis direction at the swinging portion 73D of the operating member 72D to one end of the connecting means 64 ( 83D) and the switching operation member 81D in a non-executing position in which the reciprocating motion in the Y-axis direction at the swinging portion 73D of the connecting operation member 72D cannot be transmitted to one end of the connecting means 64. Slit portions 85D and 86D for guiding the movement of the switching operation member 81D between the second engaging hole portion 84D, the first engaging hole portion 83D, and the second engaging hole portion 84D, and the switching operation. The pressing member 82D is provided with a pressing spring 82D as an elastic body for holding the member 81D by the pressing force in the running position or the non-running position.

The first engaging hole portion 83D and the slit portion 85D are formed so as to penetrate the swinging portion 73D of the coupling operation member 72D. The first engagement hole 83D is a circular hole formed in a penetrating state, and the slit portion 85D has a width that is larger than the inner diameter of the engagement hole 83D while its one end communicates with the first engagement hole 83D. It is narrowly set. In addition, the other end of the slit portion 85D is opened toward the outside.

The second engaging hole portion 84D and the slit portion 86D are formed so as to penetrate the plate-shaped bracket 88D fixed to the sewing machine bed portion 21. The second engaging hole portion 84D is a circular hole having the same diameter as the first engaging hole portion 83D formed in the penetrating state, and one end portion of the slit portion 86D communicates with the second engaging hole portion 84D. At the same time, the width is set narrower than the inner diameter of the engaging hole 84D. In addition, the other end of the slit portion 86D is opened toward the outside. And the slit part 86D becomes parallel with the slit part 85D mentioned above in the state in which the contact part 71D of the connection operation member 72D abuts on the outer peripheral parts other than the cam member 61 of the plate cam 32, and At the same time, the opening ends of the respective slit portions 85D and 86D are set to face each other.

The switching operation member 81D is cylindrical and inserted into and held in a spherical bearing 65 provided at one end of the connecting means 64. One end (lower end) of the switching operation member 81D is formed to have a smaller diameter than the other parts so that insertion and separation of the engaging hole portions 83D and 84D can be performed, and the other end (upper end) The diameter is large so that it can be easily caught at the time of insertion and removal of the engaging holes 83D and 84D.

The lower end of the switching operation member 81D is set to an outer diameter of a size which can be inserted into the engaging hole portions 83D and 84D and cannot be inserted into the slit portions 85D and 86D.

Inside the switching actuating member 81D, the above-mentioned pressing spring 82D is accommodated, and a stepped screw 87D is inserted through the center of the pressing spring 82D and the switching actuating member 81D. The stepped screw 87D is mounted with the nut 89D fastened to the distal end in a state where the distal end (lower end) is inserted through the coupling hole 83D or 84D. Such a nut 89D has a larger outer diameter than the engaging hole portions 83D and 84D, whereby the switching actuating member 81D is prevented from falling upward with respect to the engaging hole portion 83D or 84D.

In addition, the pressing spring 82D always presses the switching actuating member 81D toward the nut 89D, and as a result, the small diameter portion of the lower end of the switching actuating member 81D is inserted into the engaging hole 83D or 84D. It is to be able to maintain the state.

According to the above configuration, the openings of the aforementioned slit portions 85D and 86D face each other in close proximity to each other, and the lower end of the switching operation member 81D is inserted into any one of the engaging hole portions 83D or 84D. In the state, when the switching operation member 81D is pulled out against the pressing spring 82D, the inner stepped screw 87D is set to an outer diameter that can pass through the slit portions 85D and 86D. The switching operation member 81D can be moved between the coupling hole portions 83D and 84D through the slit portions 85D and 86D.

Then, in the state where the switching actuating member 81D is inserted into the first engaging hole 83D, the swinging part 73D of the connecting actuating member 72D and the connecting means 64 are in a state of being connected to each other. The rocking motion of the connection operation member 72D made by the contact portion 71D held by the 72D contacting the cam member 61 of the rotating plate cam 32 can be transmitted to the seal holding member 63, The knot can be executed by moving to the thread holding position.

Further, in the state where the switching actuating member 81D is moved and inserted into the second engaging hole portion 84D, the rocking motion of the connecting actuating member 72D is not transmitted to the connecting means 64, and further, the connecting means. Since one end of the 64 is held by the bracket 88D, the thread holding member 63 can be held at a position behind the thread holding position so as not to execute the knot.

With the above configuration, in the switching means 80D, the state in which the switching operation member 81D is inserted into any one of the engaging hole portions 83D or 84D by the elasticity of the pressing spring 82D is maintained. It is possible to keep the knot running or non-executing, and withdraw the switching actuating member 81D from the engaging hole 83D or 84D against the elastic force of the pressing spring 82D and at the same time engage the engaging hole 83D and 84D. By moving in between and inserting selectively, it is possible to switch between setting the knot and not performing the knot.

By this configuration, the knot mechanism 60D can exhibit almost the same effect as the knot mechanism 60.

(6th Embodiment)

As a sixth embodiment, an example of another knot mechanism 60E will be described based on FIGS. 31 to 34. FIG. 31 is a perspective view showing a main part of the knot mechanism 60E, FIG. 32 is an exploded perspective view, and FIGS. 33 and 34 are views for explaining the switching operation of the switching means 80E included in the other knot mechanism 60E. In addition, since the switching means 80E in this embodiment has the same structure as the above-mentioned switching means 80D, FIG. 29 is also useful in this embodiment, and all the configurations regarding the switching means 80E in FIG. It should be recorded in parentheses.

In addition, the differences from the round bar sewing machine 100 will be mainly described, and the same components as the round bar sewing machine 100 will be given the same reference numerals and description thereof will be omitted.

The knot mechanism 60E is characterized in that the connecting means 64E is provided with switching means 80E for switching between execution and non-execution of the knot by the thread holding member 63.

That is, the knot mechanism 60E has the plate cam 32 which has the cam member 61, and the contact part 71E which abuts on the cam member 61, and the said contact part 71E and the cam member 61 are matched. The oscillating means 70E pivotally pivotally supported about the shaft member 62 by the contact with the shaft member 62 is reciprocally supported below the needle plate 12, and the needle falls before the two needles from the last needle by rotation. To the thread holding member 63 for holding the first loop formed by the first loop, the connecting means 64E for connecting the rocking portion of the rocking means 70E to the thread holding member 63, and the thread holding member 63. Switching means 80E for switching between execution and non-execution of the knot.

First, the swinging means 70E has a contacting portion 71E that abuts against the cam member 61, and a swinging operation member 72E that swings around the shaft member 62, and the coupling operation member 72E. The contact portion 71E has a tension spring 76E which adds the connection actuating member 72E in the rotational direction in pressure contact with the outer circumference of the plate cam 32.

The connection operation member 72E is axially supported by the shaft member 62 along the X-axis direction at the center thereof, and is disposed adjacent to the plate cam 32 at the side of the sewing machine bed portion 21.

The connecting operation member 72E is connected to the connecting means 64E at the swinging portion 73E away from the shaft member 62.

In addition, the connecting operation member 72E is connected to the tension spring 76E at another swinging portion 74E away from the shaft member 62, and the contact portion 71E is pressed against the outer circumference of the plate cam 32. It is joined to rotate.

Moreover, when the contact part 71E contacts the cam member 61 by the rotation operation of the plate cam 32, it rotates to the opposite direction to the direction to which the tension spring 76E presses.

The connecting means 64E includes a first link body 65E having one end connected to the linking operation member 72E, a second link body 66E having one end connected to the thread holding member 63, and a second link body ( The other end and one end of the 66E are connected to each other, and the center portion has a third link member 67E pivotally rotatably supported by the sewing machine bed 21 via a step screw 68E. In addition, the other end of the third link member 67E is connectable to the other end of the first link member 65E via the switching means 80E.

The connecting means 64E has a configuration substantially the same as that of the connecting means 64 described above, except that disconnection between the first link body 65E and the third link body 67E is possible.

The switching means 80E is provided between the third link member 67E and the first link member 65E as described above, and is capable of carrying out the connection-disconnection thereof.

The switching means 80E includes a switching operation member 81E for switching the connection and disconnection between the first link member 65E and the third link member 67E of the connecting means 64E by the position switching operation, and the connecting means. A first engagement hole 83E for holding the switching operation member 81E in an execution position capable of transferring the swinging motion from the first link member 65E of the 64 to the third link member 67E, and the connecting means. A second engaging hole portion 84E for holding the switching operation member 81E in a non-executing position in which the swinging motion cannot be transmitted from the first link member 65E of the 64 to the third link member 67E; The slit portions 85E, 86E for guiding the movement of the switching actuating member 81E between the first engaging hole 83E and the second engaging hole 84E, and the switching actuating member 81E are in the running position or the non-executing position. The pressure spring 82E as an elastic body held by the pressing force is provided.

The first engaging hole portion 83E and the slit portion 85E are formed so as to penetrate the other end portion of the third link member 67E of the connecting means 64E. The first engagement hole 83E is a circular hole formed in a penetrating state, and the slit portion 85E has a width greater than the inner diameter of the engagement hole 83E while its one end communicates with the first engagement hole 83E. It is narrowly set. In addition, the other end of the slit portion 85E is opened toward the outside.

The second engaging hole portion 84E and the slit portion 86E are penetrated by the L-shaped arm member 88E rotatably axially supported on the sewing machine bed portion 21 via a stepped screw 90E. Formed. The second engagement hole portion 84E is a circular hole having the same diameter as the first engagement hole portion 83E formed in the penetrating state, and one end portion of the slit portion 86E communicates with the second engagement hole portion 84E. At the same time, the width is set narrower than the inner diameter of the coupling hole 84E. In addition, the other end of the slit portion 86E is opened toward the outside.

The third link member 67E is brought into contact with the side of the stopper 91E provided under tension by the tension spring 92E, and the arm member 88E is similarly tensioned by the tension spring 93E. It is in contact with the side of the stopper 94E provided in parallel. In such a state, the slit portions 86E and the slit portions 85E are set to be parallel to each other and are arranged to face the opening ends of the respective slit portions 85E and 86E to face each other.

In addition, the stopper 91E has the other end portion of the first link member 65E in a state in which the contact portion 71E of the connecting operation member 72E abuts against the outer circumference of the plate cam 32 other than the cam member 61. The front end position of the third link member 67E is positioned so that the first engagement hole 83E of the third link member 67E coincides with the Y-axis direction, and the contact portion 71E of the connection operating member 72E is provided with the cam member 61. The stopper 91E is arrange | positioned so that the 3rd link body 67E may contact from the direction which does not prevent the rotation in the case of contacting with the.

The switching operation member 81E is cylindrical and is kept inserted in the spherical bearing 69E provided at the other end of the first link member 65E of the connecting means 64E. The switching operation member 81E is formed so that its one end (lower end) is smaller in diameter than the other part so that insertion and separation of the engaging holes 83E and 84E can be performed, and the other end (upper end) The diameter is large in order to make it easy to grasp when inserting and detaching the engaging holes 83E and 84E.

The lower end of the switching operation member 81E is set to an outer diameter of a size that can be inserted into the engaging holes 83E and 84E and cannot be inserted into the slit portions 85E and 86E.

Inside the switching actuating member 81E, the above-mentioned pressing spring 82E is accommodated and a stepped screw 87E is inserted through the center of the pressing spring 82E and the switching actuating member 81E. The stepped screw 87E is mounted with the nut 89E fastened to the distal end in a state where the distal end (lower end) is inserted through the coupling hole 83E or 84E. Such a nut 89E has a larger outer diameter than the engaging hole portions 83E and 84E, whereby the switching actuating member 81E is prevented from falling upward relative to the engaging hole portion 83E or 84E.

In addition, the pressing spring 82E always presses the switching actuating member 81E toward the nut 89E. As a result, the small diameter portion of the lower end portion of the switching actuating member 81E is inserted into the engaging hole 83E or 84E. It is to be able to maintain the state.

According to the above configuration, the openings of the aforementioned slit portions 85E and 86E face each other in close proximity to each other, and the lower end of the switching operation member 81E is inserted into any one of the coupling hole portions 83E or 84E. In the state, when the switching operation member 81E is pulled out against the pressing spring 82E, the inner stepped screw 87E is set to an outer diameter that can pass through the slit portions 85E and 86E. The switching actuating member 81E can be moved between the engaging hole portions 83E and 84E through the slit portions 85E and 86E.

Then, in the state where the switching operation member 81E is inserted into the first engagement hole 83E, as shown in FIG. 33, the first link member 65E and the third link member 67E of the connecting means 64E. ) Is in a connected state, and the swinging operation of the connecting operation member 72E caused by the contact portion 71E held by the connecting operating member 72E abuts against the cam member 61 of the rotating plate cam 32. Since it can transmit to the holding member 63, it can move to a thread holding position and can make a knot.

Further, in the state where the switching operation member 81E is moved and inserted into the second engagement hole 84E, the swinging operation of the connection operating member 72E is transmitted to the arm member 88E, as shown in FIG. Since it is not transmitted to the thread holding member 63, the thread holding member 63 can be held at a position rearward from the thread holding position by the tension of the tension spring 92E so as not to execute the knot.

With the above configuration, in the switching means 80E, the state in which the switching operation member 81E is inserted into any one of the engaging hole portions 83E or 84E by the elasticity of the pressing spring 82E is maintained. The knot can be kept in a running or non-running state, and withdraws the switching actuating member 81E from the engaging hole portion 83E or 84E against the elastic force of the pressing spring 82E and at the same time engages the engaging hole portions 83E and 84E. By moving in between and inserting selectively, it is possible to switch between setting the knot and not performing the knot.

By this configuration, the knot mechanism 60E can exhibit almost the same effect as the knot mechanism 60.

(7th Embodiment)

As a seventh embodiment, an example of another knot mechanism 60F will be described based on FIGS. 35 to 37. FIG. 35 is a perspective view showing the main part of the knot mechanism 60F, FIG. 36 is an exploded perspective view of the switching means 80F included in the knot mechanism 60F, and FIG. 37 is a switching means 80F provided by the other knot mechanism 60F. Is a view for explaining a switching operation. In addition, the differences from the round bar sewing machine 100 will be mainly described, and the same configuration as the round bar sewing machine 100 will be given the same reference numerals and redundant description will be omitted.

In the knot mechanism 60F, the plate cam 32 is provided with switching means 80F for switching between execution and non-execution of the knot by the thread holding member 63.

That is, the knot mechanism 60F is capable of reciprocating downward from the plate cam 32 having the cam member 61F, the same rocking means 70E as the knot mechanism 60E described above, and the needle plate 12. And the thread holding member 63 holding the first loop formed by the needle drop before the two needles from the last needle by the rotation, and the rocking portion and the thread holding member 63 of the rocking means 70E. The connecting means 64 which connects, and the switching means 80F which switch between execution and non-execution of a knot by the thread holding member 63 are provided.

The switching means 80F includes a base 88F fixedly mounted to the reduction shaft 31 to rotate together with the base member 88F rotatably supporting the cam member 61F with the stepped screw 86F as a support shaft, The cam member 61F is formed on the base 88F and the switching operation member 81F which can be switched to the non-execution position which cannot be contacted with the execution position which can contact the contact part 71E by a position switching operation. At the same time, the first engagement hole portion 83F holding the switching operation member 81F in the running position and the second engagement hole portion formed in the base 88F and holding the switching operation member 81F in the non-running position ( 84F), the slit portion 85F for guiding the movement of the switching actuating member 81F between the first engaging hole 83F and the second engaging hole 84F, and the switching actuating member 81F in an execution position or The pressing spring 82F as an elastic body held by the pressing force at the non-execution position is provided.

The base 88F is elongate plate-shaped, and is provided with the sleeve which inserted and holds the adjustment shaft 31 in the intermediate position. A stepped screw 86F is provided at one end side with the sleeve interposed therebetween, and the first and second engaging hole portions 83F and 84F and the slit portion 85F are formed at the other end.

The cam member 61F is an arc-shaped plate body having the same diameter as the plate cam 32, is axially supported by the stepped screw 86F at one end thereof, and switched to the other end via a stepped screw 87F described later. The operating member 81F is mounted.

Moreover, the projection which functions as the main cutting part of a cam protrudes in the direction toward the outer side of an edge in the middle of the circular arc edge part.

The first engagement hole portion 83F is positioned at a position (execution position) where the circular arc edge portion of the cam member 61F can be positioned to coincide with the outer circumferential edge portion of the plate cam 32 by inserting the switching operation member 81F. It is arranged.

The second engaging hole portion 84F is a position where the projection of the cam member 61F can be retracted from the outer circumferential edge of the plate cam 32 by inserting the switching operation member 81F (non-executing position). )

One end of the slit portion 85F communicates with the first engagement hole 83F, the other end communicates with the second engagement hole 84F, and the width of the slit portion 85F is greater than the inner diameter of each of the engagement holes 83F and 84F. This is set narrow.

The switching operation member 81F has a cylindrical shape, one end of which is formed to have a smaller diameter than the other part so that insertion and separation of the engaging hole portions 83F and 84F can be performed, and the other end of each of the engaging hole portions ( 83F and 84F) are large in diameter for ease of grip during insertion and removal.

A part of the switching operation member 81F is set to an outer diameter of a size that can be inserted into the engaging hole portions 83F and 84F and cannot be inserted into the slit portions 85F and 86F.

Inside the switching actuating member 81F, the above-mentioned pressing spring 82F is accommodated, and a stepped screw 87F is inserted through the center of the pressing spring 82F and the switching actuating member 81F. The tip end screw 87F is screwed into the cam member 61F and fixed in a state where the stepped screw 87F is inserted into the engaging hole portions 83F and 84F or the slit portion 85F.

In addition, the pressing spring 82F always presses the switching actuating member 81F toward the base 88F, and as a result, the small diameter portion of the lower end of the switching actuating member 81F is inserted into the engaging hole 83F or 84F. It is to be able to maintain the state.

With the above arrangement, when the switching operation member 81F is pulled out against the pressing spring 82F while the lower end of the switching operation member 81F is inserted into any one of the coupling hole 83F or 84F. Since the inner stepped screw 87F is set to an outer diameter capable of passing through the slit portion 85F, the switching actuating member 81F passes through the slit portion 85F and is engaged between the coupling hole portions 83F and 84F. ) Can be moved.

Then, in the state where the switching operation member 81F is inserted into the first engagement hole 83F, as shown in Fig. 35, the projection of the cam member 61F protrudes from the outer peripheral edge of the plate cam 32. As the plate cam 32 rotates, the projection of the cam member 61F abuts on the contact portion 71E, swings the connecting operation member 72E and simultaneously seals the seal holding member 63 to the thread holding position. Can be run to run the knot.

In the state where the switching operation member 81F is moved and inserted into the second engagement hole 84F, as shown in Fig. 36, the projection of the cam member 61F is larger than the outer peripheral edge of the plate cam 32. It is in a retracted state. Since the connection operation member 72E includes a stopper (not shown) which restricts the rotation range so as not to rotate to the inner side of the plate cam 32, the cam member (even if the plate cam 32 is rotated). The projection of 61F does not contact the contact portion 71E, and the yarn holding member 63 can be retracted from the yarn holding position so that the knot is not executed.

With the above configuration, in the switching means 80F, the state in which the switching operation member 81F is inserted into any one of the engaging hole portions 83F or 84F by the elasticity of the pressing spring 82F is maintained and knotted. Can be maintained in a running or non-running state, and move between the coupling hole portions 83F or 84F at the same time as removing the switching operation member 81F from the coupling hole portion 83F or 84F against the elastic force of the pressing spring 82F. By selectively inserting the knot, the knot execution and non-execution settings can be switched. In other words, in the present embodiment, the switching operation member 81F is moved to the execution position and the non-execution position of the swinging means 70E by the appearance of the projection member (cam part) of the cam member 61F on the outer circumferential surface of the knot cam 32. It remains to be switched.

By this configuration, the knot mechanism 60F can exhibit almost the same effect as the knot mechanism 60.

(8th Embodiment)

As an eighth embodiment, an example of another switching means 80G will be described based on FIGS. 38 to 41. FIG. 38 is an exploded perspective view showing the main parts of the switching means 80G, FIG. 39 is an enlarged perspective view of the main parts of the switching means 80G, and FIGS. 40 and 41 are views for explaining the switching operation of the switching means 80G. . In addition, the differences from the round bar sewing machine 100 will be mainly described, and the same components as the round bar sewing machine 100 will be given the same reference numerals and description thereof will be omitted.

In this embodiment, the switching means 80G is provided in the coupling mechanism which transmits the rocking motion from the connection operating member 72E to the thread holding member 32, and the switching means 80G and the connection not shown in the figure. The configuration other than the means is the same as the sewing machine equipped with the knot mechanism 60E described above. The connecting means, not shown, on which the switching means 80G is mounted is, as with the connecting means 64E, a first link body having one end connected to the connection operating member 72E, and one end connected to the seal holding member 63. It has a 2nd link body, and the 3rd link body which the other end part and one end part of a 2nd link body connected. In addition, unlike the connecting means 64E, in the connecting mechanism (not shown), the third link member is directly connected to the other end of the first link member via the screw hole 86G, and the second link member is directly connected to the second link member. The switching means 80G is provided between the seal holding member 63 and the seal holding member 63.

The switching means 80G extends from one end of the second link member of the connecting means toward the thread holding member 63, and has a plate-shaped link member for imparting a swinging movement force from the connecting operating member 72E. 82G) and the switching operation member 81G which consists of a plate-shaped spring member pivotally supported by the support shaft 87G located in the vicinity of the front-end | tip part of the upper surface of the plate-shaped link body 82G.

The plate-shaped link member 82G and the switching actuating member 81G can overlap the leading ends of each other by the rotation operation of the switching actuating member 81G, and couplings formed on the thread holding members 63 are provided at the respective leading ends. A first opening portion 83G and a second opening portion 84G through which the projection 63a can be inserted are formed to penetrate.

The engaging projection 63a formed in the yarn holding member 63 is formed away from the rotation support shaft 63b of the yarn holding member 63, and the yarn holding member 63 is provided by applying an external force to the coupling protrusion 63a. Is rotated about the rotation support shaft 63b. In addition, the seal holding member 63 is tensioned by a spring (not shown) from the seal holding position to the retraction rotation direction side, and is located behind the seal holding position unless an external force is applied to the engaging projection 63a. The state is to be maintained.

A positioning projection 85G protruding downward is formed on the lower surface side near the rear end of the switching operation member 81G. As shown in Figs. 40 and 41, the switching operation member ( 87G) is rotated so that the positioning projection 85G abuts on both sides of the plate-shaped link member 82G in the X-axis direction so as to be switched between the execution position and the non-execution position of the knot described later. Further, since the switching operation member 81G is a material having a spring property, the switching operation member 81G is bent upward so as to be bent upward against the elasticity generated by the switching operation member 81G itself, so that the positioning projection 85G is plate-shaped link member 82G. It is necessary to carry out the above switching of the respective positions beyond the upper side of h). That is, the switching operation member 81G itself functions as an elastic body held by the pressing force at the running position or the non-running position of the knot.

The first opening portion 83G formed in the plate-shaped link member 82G is formed in an L-shape, and the reciprocating portion in which the L-shaped longitudinal sides are transmitted from the linking operation member 71E to the plate-shaped link member 82G. It is formed so that it may follow the direction matched with an operation direction, and it is formed in the length same as the reciprocating stroke, or more length.

Further, the second opening portion 84G formed in the switching operation member 81G is formed in a straight line shape, and is positioned to coincide with the L-shaped longitudinal side of the first opening portion 83G in the non-executing position, and has a plate-shaped link. It is formed with the length or length more than the reciprocation stroke of 82 G of sieves.

Fig. 40 shows a state where the switching operation member 81G is positioned at the execution position of the knot by the positioning projection 85G. As shown in FIG. 40, in the execution position, only a part of the first opening portion 83G of the plate-shaped link member 82G and the second opening portion 84G of the switching operation member 81G overlap, and the seal holding member The engaging projection 63a of the 63 is inserted into such a state that it does not rattle. Therefore, the rotational force of the seal holding member 63 is imparted by the reciprocating operation of the plate-shaped link member 82G.

Fig. 41 shows a state where the switching operation member 81G is positioned at the non-execution position of the knot by the positioning projection 85G. As shown in FIG. 41, in the non-execution position, the L-shaped longitudinal side portion of the first opening 83G of the plate-shaped link member 82G coincides with the second opening 84G of the switching operation member 81G. In the longitudinal direction of the overlapping portions, the engaging projection 63a of the seal retaining member 63 is in a movable state. Therefore, even when the plate-shaped link member 82G is reciprocated, the engaging projection 63a moves relative to each of the openings 83G and 84G so that the rotational force is not applied to the seal holding member 63. do,

With the above arrangement, in the switching means 80G, the switching operation member 81G is selectively operated by the elasticity of the switching operation member 81G and the positioning projection 85G in the execution position and the non-execution position of the knot. It is possible to maintain the running or non-running state of the knot, and by switching the switching operation member 81G to the running position and the non-running position against the elastic force of the switching operation member 81G, execution and non-execution of the knot. You can switch the setting of.

With this configuration, the knot mechanism provided with the switching means 80G can exhibit almost the same effect as the knot mechanism 60.

(Ninth embodiment)

As a ninth embodiment, an example of another switching means 80H will be described based on FIGS. 42 to 46. FIG. 42 is an exploded perspective view showing main parts of the switching means 80H, and FIGS. 43, 44, 45, and 46 are views for explaining the switching operation of the switching means 80H. In addition, the differences from the round bar sewing machine 100 will be mainly described, and the same components as the round bar sewing machine 100 will be given the same reference numerals and description thereof will be omitted.

In this embodiment, the switching means 80H is provided in the thread holding member 32, and all the structures other than the switching means 80H and the connection means not shown are equipped with the knot mechanism 60E mentioned above. Same as one sewing machine. The connecting means (not shown) includes, as with the connecting means 64E, a first link body having one end connected to the connection operating member 72E, a second link body having one end connected to the thread holding member 63, and a second link. It has a third link body connected to the other end of the sieve and one end. In addition, unlike the connecting means 64E, the connecting mechanism (not shown) has a second link member whose other end is directly connected to the other end of the first link member, and the second link member 66 and the seal holding member ( The engaging projection 63a of 63 is directly connected.

80H of switching means are provided in the long plate-shaped switching operation member 81H which has the rotation support shaft 63b of the thread holding member 63 on the upper surface, and the needle plate 82H, and is for performing a knot. The first holding portion 83H for positioning the switching operation member 81H at the execution position, and the switching operation member 81H for positioning at the non-execution position provided in the needle plate 82H to not execute the knot. The second holding part 84H is provided.

One end of the switching operation member 81H is axially supported by the shaft portion 87H on the lower surface side of the needle plate 82H, and is rotated by manual operation on the other end.

And the support shaft 86H of the thread holding member 63 protrudes upwards on the upper surface side of the longitudinal direction intermediate position of the switching actuation member 81H, and is hold | maintained by the rotation operation of the switching actuation member 81H. The rotation support point position of the member 63 can be moved along the circumference centering on the support shaft 86H.

The first holding portion 83H and the second holding portion 84H both consist of a notch formed on the side edge portion of the needle plate, and the rotating end of the switching actuating member 81H has a first holding portion of each notch shape ( 83H) and the 2nd holding part 84H can be selectively inserted.

The switching actuating member 81H is a plate-shaped body having a spring property, and is bent downward so as to be bent downward against the elasticity generated by the switching actuating member 81H itself, so that the first holding part 83H and the second holding part 84H are formed. It is necessary to carry out the switching of the respective positions beyond the partition protrusion 85H formed between the two ends. That is, the switching operation member 81H itself functions as an elastic body which is held by the pressing force at the running position or the non-running position of the knot.

43 and 44 show a state where the switching operation member 81H is positioned at the execution position of the knot by the first holding portion 83H. As shown in Figs. 43 and 44, in the execution position, the needle falls just outside the rotational trajectory of the tip end portion of the thread holding member 63, and the thread is properly held so that the knot can be executed.

45 and 46 show a state where the switching operation member 81H is positioned at the non-execution position of the knot by the second holding portion 84H. 45 and 46, in the non-running position, the needle falls inside the rotational trajectory of the distal end of the thread holding member 63, and the thread is not properly held, and the knot cannot be executed.

With the above arrangement, in the switching means 80H, the switching operation member 81H is elastically formed by the switching operation member 81H and the projection 85H is formed by the respective holding portions 83H and 84H. The position and the non-execution position can be selectively maintained to maintain the execution or non-execution state of the knot, and to switch the changeover operation member 81H to the execution position and the non-execution position against the elastic force of the changeover operation member 81H. By doing so, it is possible to switch between setting the knot and not performing the knot.

With this configuration, the knot mechanism provided with the switching means 80H can exhibit almost the same effect as the knot mechanism 60.

According to the invention according to claim 1, a thread holding member is provided, and when the knot is made, the length of the thread against the pulling of the first loop (the loop due to the needle drop from the last needle to the front of the two needles) to the to-be-sealed material side is At the same time, the end of the first loop is pulled into the second loop together with the third loop by releasing the second loop (the loop due to the needle drop one needle before the final needle) from the end needle before being pulled to the side to be sewn. Because of the tight binding, the end of the sewing thread can form a solid knot that is not easily released just by exiting from one loop.

In addition, since the replacement of parts is unnecessary, it is not necessary to fine-tune the assembly position of the parts every time the knot is switched, and the switching operation can be performed more easily and quickly.

Accordingly, even when the sewing attachment in the sewing attachment operation is changed from a button to a label, for example, the above switching operation can be performed, thereby achieving a drastic improvement in work efficiency.

According to the invention as set forth in claim 2, in the case of switching between the execution of the solid knot and the normal knot, the switching operation member only has to be operated in a simple operation of switching between the running position and the non-running position against the elastic force of the elastic body. The work can be performed remarkably easily and quickly.

According to the invention as set forth in claim 3, it is possible to switch between the execution position and the non-execution position only by operating the switching operation member having the contact portion, and there is no need to switch over the switching means as a whole, so that the switching operation is performed smoothly. You can do it.

According to the invention of claim 4, since the position of the cam member which determines the operation timing of the thread holding member can be adjusted, even if the needle movement is performed at high speed, the knot can be formed at an appropriate operation timing.

According to the invention as set forth in claim 5, switching between the running position and the non-executing position is possible by the lifting operation of the cam part, and the switching operation can be performed smoothly because it is not necessary to switch the whole knot cam.

Claims (5)

Shanghai sewing needle, A rotary looper cooperating with the sewing needle to form needle stitches of the round bar; A knot cam having a cam portion, Rocking means having a contact portion which is in contact with the cam portion of the knot cam, the pivot portion being pivotally supported about the shaft member by abutting the contact portion and the cam portion; And a thread holding member connected to the rocking portion of the rocking means and reciprocating to hold a first loop formed by the needle drop before the two needles from the final needle. The thread holding member keeps the thread length of the first loop longer than normal needle stitch at its thread holding position, and upon falling of the last needle, before the second loop following the first loop is close to the material to be sealed. A round bar sewing machine which forms a knot by passing a first loop through a second loop together with a third loop formed by falling of a final needle by moving from a thread holding position to release the first loop. And switching means for switching between execution and non-execution of the knot by the thread holding member, Round switch sewing machine, characterized in that configured to select whether or not to execute the knot formation by switching between the switching operation member, the execution position and the non-execution position. The method of claim 1, wherein the switching means, A switching operation member for switching the execution and non-execution of the knot by a position change between a running position and a non-running position, and an elastic body for holding the switching operation member in the running position or the non-running position by a pressing force, Round switch sewing machine, it characterized in that it is configured to select whether or not to execute the knot formation by switching between the running position and the non-execution position against the elastic force. The method of claim 2, wherein the switching means,  A connection operating member that swings about the shaft member; The switching operation member having the contact portion; Characterized in that the locking fixing means for locking the switching operation member to the non-execution position that cannot be in contact with the execution position where the contact portion is in contact with the cam portion is fitted to the connection operation member. Round sewing machine. The cam portion of the knot cam according to claim 2, Round bar sewing machine characterized in that the position is configured to be adjustable along the outer periphery of the knot cam. The method of claim 2, wherein the switching means, And the switching operation member keeps the cam portion capable of switching between the execution position for oscillating the oscillation means and the non-execution position without oscillation of the oscillation means by the appearance of the cam from the outer circumferential surface of the knot cam. Round bar sewing machine.

Images