CN1676718B - sewing machine - Google Patents

Abstract

A sewing machine is provides with a stepmotor and a gear driving mechanism for driving a cloth presser cam and a tread sweeping cam through driving gears by the stepmotor, the gear driving mechanism comprising driving gear fixed on the output shaft of the stepmotor, and a driven gear for driving the cloth presser cam and tread sweeping cam, wherein the diameter of the driving gear is made smaller than the diameter of the driven gear.

Description

sewing machine

technical field

The present invention relates to a sewing machine with a structure in which the cloth pressing action of the presser foot and the thread pulling action of the thread wiper are performed by an actuator through a gear drive mechanism at the beginning of sewing.

Background technique

In the past, in the sewing machine for forming bar tack reinforcement stitches, a cloth pressing mechanism is provided to drive the presser feet of the processed cloth when the stitches are formed, and at the same time, a thread wiper is provided to hang down from the eyelet of the sewing needle. The wire end of the upper thread carries out the dialing mechanism of the wire, and this structure has been put into practical use.

For example, in Japanese Patent Laid-Open No. 69560, 2005, there is described a cloth pressing mechanism that moves the cloth pressing foot up and down and a wire wiping arm (wiring device) that swings between the action position and the standby position. Mechanism of sewing machine. Moreover, these cloth pressing mechanisms and wire pulling mechanisms are driven by a common driving device. The driving device is composed of a power cam, a clutch body, a power pulley and the like.

In this sewing machine, before sewing starts, the thread pulling arm is in the action position, and the pressing plate at the lower end of the bar is in the rising position, so there is a gap between the pressing plate and the spring pressing plate, and the presser claw is in the rising position.

Once the starting pedal is stepped on, along with the rotation of the power pulley, the thread arm is swung from the action position to the standby position through the thread connection link mechanism, and the upper thread end hanging down from the eye hole of the sewing needle is threaded, and at the same time The pressing plate is lowered by the presser foot link mechanism, and the presser claw is lowered by the pressure spring.

However, recently, in the case of aligning the sewing position of the processed cloth for sewing, etc., it is desired to have a presser claw that moves up and down to the height position indicated by the numerical value on the operation panel and is held at the height position. structure. For this reason, it has been considered to use a stepping motor whose rotation amount can be adjusted as a drive source. In this case, the following structure is adopted: by driving the stepping motor, the presser foot cam and the thread removal cam are driven to rotate, the presser foot claw is moved up and down by the cloth presser foot cam, and the thread removal arm is moved by the thread removal cam at the same time. line action.

In this case, generally, the cloth pressing roller is always in contact with the cloth pressing cam by giving elasticity to the cloth pressing spring member, and at the same time, the elasticity is given by the spring member for thread removal so that the thread removal roller is always in contact with the thread removal cam. catch.

In addition, when a structure in which the output shaft of the above-mentioned one stepping motor is used to directly drive the presser cam and the thread-drawing cam simultaneously with elastic force, a large driving torque is required as a stepping motor.

That is, the stepping motor will simultaneously and directly produce the following action: When the above-mentioned stepping motor moves the presser foot up and moves, the cloth pressing roller will expand toward the radius along the cloth pressing cam against the elastic force of the spring member for pressing cloth. The operating load when moving in the direction of the wire is added to the operating load when the wire removing roller moves along the wire removing cam to overcome the spring force of the wire removing spring member to expand the radius when the wire removing arm is swung.

In this way, a large stepping motor is required to generate a large driving torque, and there are problems such as an increase in the size of the sewing machine and high manufacturing costs.

Contents of the invention

In view of the above-mentioned problems, an object of the present invention is to sufficiently drive the cloth pressing mechanism and the wire removal mechanism even if the rotational torque of the stepping motor is small in a structure in which the cloth pressing mechanism and the wire removal mechanism are driven by one step. For the mechanism, a stepping motor with a small rotating torque can be used.

The sewing machine of the present invention has: a cloth pressing mechanism that moves the cloth pressing foot up and down through the cloth pressing cam, and a thread wiping mechanism that makes the thread wiping device that wields the end of the thread on the upper thread perform the wiping action through the wiping cam. It is characterized in that it includes: a stepping motor that jointly drives the cloth pressing cam and the thread removal cam; and the cloth pressing cam and the thread removal cam are driven by multiple gears driven by the stepping motor A gear drive mechanism for driving, the gear drive mechanism has: a drive gear fixed on the output shaft of the stepping motor; The diameter is smaller than the diameter of the driven gear.

Thereby, owing to have gear mechanism, and this gear mechanism has the drive gear that is fixed on the output shaft of stepper motor and the driven gear that drives described cloth pressing cam and line cam, the diameter of drive gear is smaller than that of driven gear. The diameter of the driven gear adopts the structure that the driving gear and the driven gear of the gear drive mechanism drive the cloth pressing cam and the wire pulling cam by the stepping motor. Compared with the rotational torque when the wire-wielding cam is driven, it can be driven with a greater rotational torque corresponding to the gear ratio of the driving gear and the driven gear. In this way, a small motor with a small rotational torque can be used as the stepping motor, and the cost of the sewing machine can be reduced.

Description of drawings

Fig. 1 is a side view of an electronic bartack reinforcement sewing machine in an embodiment of the present invention.

Fig. 2 is a perspective view seen from the rear of the electronic bartack reinforcement sewing machine.

Fig. 3 is a side view of the internal structure of the electronic bartack reinforcement sewing machine.

Fig. 4 is a rear view of the electronic bartack reinforcement sewing machine.

Fig. 5 is a longitudinal sectional side view taken along line 5-5 of Fig. 4 .

Fig. 6 is a front view of the electronic bartack reinforcement sewing machine with the wire wiper at the swing position.

Fig. 7 is a view corresponding to Fig. 6 when the wiper is in the standby position.

FIG. 8 is a diagram corresponding to FIG. 5 in which the rotation phase of the wire wiper cam has been changed.

Fig. 9A is a time chart showing the operation of the presser foot.

Fig. 9B is a timing chart showing the operation of the wiper when the material is thin.

Fig. 9C is a timing chart showing the operation of the wiper in the case of thick material.

Fig. 10 is a diagram corresponding to Fig. 4 in a modification.

Detailed ways

An embodiment in which the present invention is applied to an electronic bar tack sewing machine will be described below. As shown in FIGS. 1 and 2 , the electronic bar tacking sewing machine 1 is placed on a workbench 8 . The sewing machine 1 is composed of a base 2 , a pillar 5 standing upward from the rear end of the base 2 , and an arm 6 extending forward from the upper end of the pillar 5 and facing the base 2 .

On the pillar portion 5 and the arm portion 6, a sewing machine motor 9 (referring to FIG. 2 ) for driving the sewing needle 11 (referring to FIG. 10 ) up and down through a needle bar 10 (referring to FIG. 10 ) and a driving mechanism for driving the sewing machine motor 9 are provided. The force is transmitted to a driving force transmission mechanism of the sewing needle 11 and the like through a main shaft (not shown). In addition, a needle bar up and down movement mechanism (not shown) for moving the needle bar 10 up and down is provided inside the head portion 7 which is the front end portion of the arm portion 6 .

Inside the head 7, the wire wiper 60 for pulling out the thread end 17a of the upper thread 17 cut by the thread trimming mechanism is pivotally mounted in the arrow Q direction of FIG. in the opposite direction. The wire wiper 60 performs a wire wiping operation by a wire wiping mechanism 52 described later.

The base portion 2 is composed of a base body portion 3 on which a pillar portion 5 is erected, and a cylindrical base portion 4 extending forward from the base body portion 3 . The base portion 2 is provided with a cloth presser mechanism 20 to be described later and a cloth feed mechanism for moving the needle plate 12 and the feed table 13 in the front-rear direction (Y direction in FIG. 1 ) and in the left-right direction (X direction in FIG. 7 ). institutions (not shown).

On this base part 2, be provided with the vertical shuttle 14 that moves synchronously with the up and down motion of sewing needle 11 to make it form bar tack reinforcement stitch, transmit the rotational driving force from sewing machine motor 9 to the lower shaft 15 of this vertical shuttle 14 And a thread trimmer (not shown) that cuts off the upper thread and the lower thread when sewing is finished.

Next, the cloth press mechanism 20 which moves the cloth press foot 24 up and down will be described. As shown in FIG. 1 and FIG. 3 , the cloth pressing mechanism 20 is provided on the feed table 13 arranged on the upper surface of the base portion 2 , and can move along the front-rear direction and the left-right direction together with the feed table 13 .

As shown in FIGS. 1 to 4 , the base end portion (rear end portion) of the press handle 21 , which is curved when viewed from the side and is supported in a cantilever shape, is fixed to the upper surface of the feeding table 13 . A presser foot mounting portion 21a for supporting a pair of right and left presser feet 24 is formed at the front end portion of the press handle 21 .

A pivot shaft 22 extending in the left-right direction is fixed to the center portion in the front-rear direction of the press handle 21 . A press lever 23 extending in the front-rear direction is rotatably pivoted via a pivot shaft 22 at substantially the central portion in the front-back direction on both left and right sides of the press handle 21 .

The front end portion of the press handle rod 23 is respectively inserted from the rear into engaging holes (not shown) of a pair of left and right presser feet 24 supported on the presser foot mounting portion 21a so as to be movable up and down. 24 snaps.

The rear end of the pressure lever 23 is rotatably connected to the upper end of the spring guide shaft 25 . The lower end portion of the spring guide shaft 25 is supported by the spring support member 26 of the press handle 21 so as to be slidable in the vertical direction. The compression coil spring 27 is arranged between the spring holder portion of the spring guide shaft 25 and the spring holder portion of the spring holder member 26 , and is arranged along the periphery of the spring guide shaft 25 .

In FIGS. 1 and 3 , elasticity is imparted in the direction of the arrow A around the pivot shaft 22 by the elastic force of the compression coil spring 27 . As a result, the two presser feet 24 are always pressed against the top of the needle plate 12 in their lowered position.

On the other hand, presser foot actuating plates 28 are respectively fixed by bolts 29 to the left and right sides of the presser lever 23 on the rear side of the pivot shaft 22 .

The presser foot operating plate 28 is pressed downward (in the direction of arrow C4 in FIG. 3 ) by a vertical movement member 47 described later, whereby the pair of left and right presser levers 23 overcome the elastic force of the compression coil spring 27. , with the pivot shaft 22 as the fulcrum to rotate in the direction of the reverse arrow A. In this way, the presser foot 24 rises to a raised position above the needle plate 12 . Here, the presser foot operating plate 28 is always in contact with the lower end surface of the vertical movement member 47 by the elastic force of the compression coil spring 27 , and there is no gap between the vertical movement member 47 and the presser foot operation plate 28 .

The cover member 30 shown in FIG. 1 is a member which covers the rear side of the pillar part 5. As shown in FIG. Inside the cover member 30 , as shown in FIGS. 2 to 4 , a substantially U-shaped fixing frame 31 is attached to an unillustrated frame.

A presser wiper drive motor 32 constituted by a stepping motor is fixed to a right side wall portion 31 a of the fixed frame 31 , and a drive gear 33 is fixed to an output shaft of the presser wiper drive motor 32 . The fixing frame 31 is composed of a right side wall portion 31a, a left side wall portion 31b, and a connecting wall portion 31c connecting the two wall portions on the lower side, and the rear side and the upper side are respectively open.

On the output shaft of the presser wiper drive motor 32 on the opposite side to which the drive gear 33 is fixed, the disc plate 51 for detecting the origin position of the presser wiper drive motor 32 (this member and the phase detection member) is fixedly attached. Correspondingly), a photoelectric sensor (not shown) is provided on the side of the disc plate 51 .

When the power is turned on, the presser wiper drive motor 32 rotates in a predetermined rotation direction, the photoelectric sensor detects the rotating disk plate 51, and outputs an origin position detection signal for setting the origin position.

The right side wall part 31a and the left side wall part 31b of the fixing bracket 31 pivotally support one camshaft 34 in the left-right direction so as to be rotatable. On the cam shaft 34, from the right side, according to the driven gear 35 meshed with the driving gear 33, the cloth pressing cam 36 that moves the cloth pressing foot 24 up and down (cloth pressing action), and the cloth pressing cam 36 that makes the wire wiper 60 produce a wire pulling action. This sequence of wire shifting cams 53 is configured. The driven gear 35 and the cloth pressing cam 36 are integrally formed, and are fixed on the cam shaft 34 by a fixing screw 37 . The dial cam 53 is fixed on the camshaft 34 by a set screw 38 .

In addition, the presser wiper drive motor 32 is fixed to the right side wall portion 31 a close to the driven gear 35 .

The wire pulling cam 53 can be changed by fine-tuning the relative phase position of the wire pulling cam 53 with respect to the cloth pressing cam 36 by loosening the fixing screw 38 with a screwdriver or the like.

A circular reference mark M is engraved on the cloth press cam 36 based on the rotation phase. In addition, two adjustment marks m1 and m2 are respectively engraved at predetermined intervals at positions adjacent to the reference mark M of the thread wiper cam 53 .

When sewing thin processed fabrics, it is only necessary to align the adjustment mark m1 with the reference mark M, which is the limit position for delaying the thread wiper 60's start timing relative to the execution of the cloth pressing operation.

In addition, when sewing heavy-duty processed cloth, it is only necessary to align the adjustment mark m2 with the reference mark M, which is the limit position to make the thread removal operation of the thread wiper 60 earlier than the start timing of the cloth pressing operation. . In this way, not only can these marks M, m1, and m2 be effectively used as references, but also the relative position of the wiper cam 53 with respect to the cloth press cam 36 can be easily changed.

The presser foot wiper drive motor 32 is a common motor for causing the cloth presser foot 24 to press the cloth and simultaneously causing the wiper 60 to perform the thread wiper operation. The diameter of the driving gear 33 is smaller than that of the driven gear 35, and the gear ratio is larger, so that a large rotational torque can be generated.

As shown in Figures 9A, 9B, and 9C, the rotating cam, that is, the cloth pressing cam 36 and the wire pulling cam 53, are fixed on the cam shaft 34, forming the cloth pressing action of the cloth pressing foot 24 by the cloth pressing cam 36 and the cloth pressing action by the wire pulling cam. 53 repeats such a phase of the wielding operation of the wielding device 60 . With the rotation of the presser wiper drive motor 32 , the cloth press cam 36 and the wiper cam 53 are integrally rotated by the drive gear 33 and the driven gear 35 .

A gear drive mechanism 50 is constituted by these drive gear 33 , driven gear 35 , cam shaft 34 , and the like.

As shown in FIGS. 2 to 4 , on the upper end portions of the right side wall portion 31 a and the left side wall portion 31 b of the fixing frame 31 , a pivot shaft 40 extending in the left-right direction is fixed. On the pivot shaft 40, the first pressing arm 41 is rotatably pivoted. The lower end of the driving side arm portion 41a of the first pressing arm 41 is connected to a pressing roller 42 capable of coming into contact with the cam surface of the cloth pressing cam 36 from the front.

The rear end portion of the pressing link 43 extending in the front-rear direction is connected to the driven-side arm portion 41b of the first pressing arm 41 . The front end portion of the pressing link 43 is connected to the driving side arm portion 45 a of the L-shaped second pressing arm 45 . The second pressing arm 45 is rotatably pivotally supported by a pivot shaft 40 fixed to an unillustrated frame of the arm portion 6 .

One end of a pin 36 is fixed to the driven-side arm portion 45 b of the second pressing arm 45 , and the other end of the pin 36 is connected to a block 48 . The block 48 is slidably attached in the front-rear direction to a vertically movable member 47 pivotally supported by the frame of the arm portion 6 so as to be movable vertically. At the lower end of the vertical movement member 47, there is a horizontal plate for pressing the presser foot operating plate 28 downward.

A tension coil spring 49 is fitted between the driven-side arm portion 41b of the first pressing arm 41 and the frame, and always applies a pressing force toward the cam surface of the cloth pressing cam 36 to the pressing roller 42 .

When the presser wiper drive motor 32 is driven to rotate forward (direction of arrow C1), the camshaft 34 is driven in the direction of arrow C1 (direction of arrow C1) in FIG. 3 . In this way, the pressing roller 42 moves along the curved actuating cam portion 36A of the cloth pressing cam 36 against the elastic force of the tension coil spring 49 in a radially expanding direction, so that the first pressing arm 41 rotates in the direction of the arrow C2. By pushing the connecting rod 43, the second pressing arm 45 rotates in the direction of the arrow C3, and the vertical movement member 47 overcomes the elastic force of the compression coil spring 27 and descends (moves in the direction of the arrow C4), pushing the presser foot actuating plate 28 down. As a result, the press lever 23 rotates in the direction of the reverse arrow A, and the presser foot 24 engaged with the front end of the press lever 23 starts to rise from the lowered position shown in FIGS. 3 and 7 (moves in the direction of the arrow C5), Move to the raised position where it rises by a predetermined distance (see Figure 6). In addition, the state of FIG. 6 corresponds to the state of FIG. 5 .

On the other hand, when the presser foot wiper driving motor 32 is reversely driven from the state of FIG. 5 (rotating in the direction of the reverse arrow C1 in FIG. 5 ), the first pressing arm 41 is moved in the direction of the reverse arrow C2 by the cloth clamping cam 36. Rotate, the second pressing arm 45 rotates in the direction of the reverse arrow C3. In this way, the push lever 23 is rotated in the direction of the arrow A as the vertical movement member 47 rises (moves in the direction of the reverse arrow C4). Thereby, the presser foot 24 moves to the descending position (refer FIG. 7) descended from the ascending position shown in FIG. 6.

Referring to Fig. 2, Fig. 3, Fig. 5 below, the thread wiping mechanism 52 of the thread wiping action performed by the thread wiping device 60 to the thread end 17a cut off by the thread trimming mechanism when sewing is finished will be described.

On the aforementioned pivot shaft 40, the first wire pulling arm 54 is pivotally supported, and at the lower end of the driving side arm portion 54a of the first wire pulling arm 54, a cam surface that can contact the wire pulling cam 53 from the front is connected. The dialing wire is with roller 55.

The rear end portion of the wiper link 56 in the front-rear direction is connected to the driven-side arm portion 54b of the first wiper arm 54 . The front end portion of the wiper link 56 is connected to the drive-side arm portion 58 a of the second wiper arm 58 .

The second wiping arm 58 has an L-shape and is rotatably pivotally supported by a pivot shaft 57 of an unillustrated frame fixed to the arm portion 6 . The driven-side arm portion 58b of the second wiper arm 58 is connected to the upper end portion of the wiper link 59 in the vertical direction.

On the other hand, as shown in FIG. 6, on the jaw (lower end) 7a of the head 7, the L is rotatably pivoted by the pivot bolt 61 fixed to the frame in the front and rear direction of the jaw 7a. The base end of the word-shaped wire wiper 60. The lower end portion of the wire wiper link 59 is connected to the drive arm 60 a of the wire wiper 60 .

As shown in FIG. 3 , a tension coil spring 62 is fitted between the driven-side arm portion 54 b of the first wire wiper arm 54 and the frame. Utilizing the elastic force of the tension coil spring 62 , a pressing force in the direction of the cam surface of the wire removal cam 53 is always applied to the wire removal roller 55 .

The front end portion of the thread wiper 60 is bent forward, so that the thread end portion 17a hanging downward from the eyelet of the sewing needle 11 can be pulled out. The dialing action is as follows. That is, when sewing starts, once the presser foot wiper driving motor 32 is driven in reverse (rotation in the direction of the reverse arrow C1), the camshaft 34 in FIG. 3 is driven in the direction of the reverse arrow C1. In this way, the roller 55 for wielding the wire moves along the curved actuating cam portion 53A of the wielding cam 53 toward the direction of reducing the radius, and the first wielding arm 54 rotates in the direction of the reverse arrow C2, and at the same time, the first wiping arm 54 is rotated by the wiping link 56. 2. The wire pulling arm 58 rotates in the direction of arrow C6 in FIG. 3 .

As a result, the wire wiper link 59 moves downward (in the direction of arrow C7 in FIG. 6 ), and the wire wiper 60 swings from the swing position shown in FIG. 6 in the direction of arrow Q to reach the standby position shown in FIG. 7 . Through this swing, the thread end 17a hanging down from the eyelet of the sewing needle 11 is pushed to the side of the sewing needle 11.

On the other hand, when sewing is finished, when the presser foot wiper drive motor 32 rotates forward (rotation in the direction of arrow C1) and drives, the thread wiper roller 55 moves along the curved actuating cam portion 53A of the thread wiper cam 53 toward the Move in the direction where the radius expands. In this way, contrary to the above, against the elastic force of the tension coil spring 62, the first wire pulling arm 54 rotates in the direction of the arrow C2. And, the second wire wiper arm 58 rotates in the direction of the reverse arrow C6, and as the wire wiper link 59 moves upward (in the direction of arrow C8 in FIG. 7 ), the wire wiper 60 swings in the direction of the arrow R from the standby position in FIG. 7 , to reach the swing position (refer to Figure 6).

The function and effect of the electronic bartack reinforcing sewing machine 1 with this structure will be described below.

As shown in Figure 4, when sewing the processed cloth of thin materials, loosen the fixing small screw 38, adjust the relative position of the thread removal cam 53, and make the adjustment mark m1 of the thread removal cam 53 and the datum of the cloth pressing cam 36 Mark M to align. That is, the relative positions of the cloth press cam 36 and the wire wiper cam 53 are in the positional relationship shown in FIG. 5 . On the cam position of this Fig. 5, the presser foot 24 is in the ascending position of Fig. 6, and the wiper 60 is in the swinging position of Fig. 6 .

In this state, when sewing is started, when the not-shown treadle is depressed, the presser wiper drive motor 32 is reversed (rotated in the direction of the reverse arrow C1 in FIG. 5 ) and driven about 100 degrees. On this basis, the cloth press cam 36 and the wire wiper cam 53 rotate synchronously and simultaneously.

Figure 9A shows the action of the presser foot 24, Figure 9B shows the action of the wire wiper 60 in the case of thin materials (when the cloth pressing cam 36 and the line cam 53 are in the phase state of Figure 5), and Figure 9C shows the action of the thick material. Occasion (occasion where the cloth pressing cam 36 and the line cam 53 are in the phase state of FIG. 8 ).

As shown in FIGS. 9A and 9B , the presser foot 24 starts to descend from time t1 , and a little later, the wiper 60 swings from the swing position to the standby position from time t to time t5 .

That is, the time t4 approximately in the middle of the time t3 to the time t5, that is, the time t4 immediately before the presser foot 24 presses the thin material processing cloth, is the time Pa when the wire wiper 60 executes thread removal. Pa, the thread end portion 17a is reliably threaded by the threader 60 (see FIG. 7 ). In this way, the sewing operation can be normally started without the thread end 17 a being pulled by the thread wiper 60 being stepped on by the presser foot 24 .

Then, when the sewing process is finished, as described above, the presser foot wiper drive motor 32 is driven forward (in the direction of arrow C1), and as the presser foot 24 moves to the raised position, the wiper 60 swings to swing position.

In this case, as previously mentioned, the presser foot wiper drive motor 32 produces the following effects at the same time: to overcome the elastic force of the tension coil spring 49 and the compression coil spring 27 to make the presser foot 24 rise and move. Overcome the elastic force of the tension coil spring 62 to make the wire wiper 60 perform the action load of the wire wiping action on the swing position.

In this way, since the operation load of the cloth pressing operation and the wire pulling operation is increased, a large rotational torque is usually required as a driving source.

But, if adopt present embodiment, then owing to be provided with the gear drive mechanism 50 that drives presser cam 36 and thread cam 53 usefulness, drive gear 33 of gear drive mechanism 50 is affixed to presser foot wiper drive motor 32. On the output shaft, the cloth pressing cam 36 and the thread cam 53 are driven by the driven gear 35 of the gear drive mechanism 50, and the diameter of the driving gear 33 is smaller than the diameter of the driven gear 35. The drive motor 32 can be driven with a higher rotational torque corresponding to the gear ratio of the drive gear 33 and the driven gear 35 than the rotational torque when the drive motor 32 is directly driven. As a result, a small motor with a small rotational torque can be used as the presser wiper drive motor 32, and cost reduction of the bar tack sewing machine 1 can be realized.

On the other hand, when the processed cloth of thick material is sewn, the fixing small screw 38 is loosened, and the relative position of the thread cam 53 is adjusted so that the adjustment mark m2 of the thread cam 53 is aligned with the reference mark M of the cloth pressing cam 36. alignment. That is, the relative positions of the cloth press cam 36 and the wire wiper cam 53 are in the positional relationship shown in FIG. 8 .

In this state, when sewing starts, when the not-shown treadle is depressed and operated, the presser wiper drive motor 32 is driven in the reverse direction (rotating in the direction of the reverse arrow C1) by about 100 degrees. In this way, the cloth pressing cam 36 rotates synchronously with the wire wiper cam 53. As shown in FIG. 9A and FIG. , to swing from the swing position to the standby position.

That is, the time t2 approximately in the middle of the time t1 to the time t3, that is, the time t2 just before the presser foot 24 presses the heavy-duty processed cloth, is the time Pb when the thread is removed by the wire wiper 60. Pb, the thread end portion 17a is reliably threaded by the threader 60 (see FIG. 7 ). In this way, also in this case, the sewing operation can be normally started when the thread end 17a pushed aside by the thread wiper 60 is not stepped on by the presser foot 24 .

In addition, with this embodiment, since the cloth pressing cam 36 and the wire pulling cam 53 are arranged on the common camshaft 34, and the driven gear 35 is fixedly connected to the camshaft 34, therefore, one driven gear 35 can be used. To rotate and drive the cloth pressing cam 36 and the wire pulling cam 53, the gear drive mechanism can be simplified.

In addition, since the relative phase position of the cloth pressing cam 36 and the wire removal cam 53 is changed, the relative timing of the wire removal operation of the wire removal device 60 with respect to the cloth pressing operation of the presser foot 24 can be adjusted. The appropriate time can be changed according to the thickness of the raw material of the processed cloth to be sewn, so the work of changing the thread pulling operation can be simplified.

In addition, since the driven gear 35 is integrally formed with at least one of the cloth pressing cam 36 or the thread cam 53, the driven gear 35 is assembled by assembling the cloth pressing cam 36 and the thread cam 53, so the driven gear can be omitted. 35 assembly operations.

In addition, since the driven gear 35 is integrally formed with the cloth pressing cam 36 on the side of the driving gear 33 in the cloth pressing cam 36 and the thread-setting cam 53, the driven gear 35 can be made close to the driving gear 33, and the gear The drive mechanism 50 is simplified.

In addition, since the disc plate 51 for detecting the origin position of the presser wiper drive motor 32 is provided at one end of the output shaft of the presser wiper drive motor 32, the presser wiper drive motor 32 The other end of the output shaft is provided with a gear drive mechanism 50, therefore, the presser foot wiper drive motor 32 can simultaneously perform the rotation of the disc plate 51 and the drive of the gear drive mechanism 50.

And, since the disc plate 51 is spaced apart from the presser foot wiper drive motor 32 and is arranged at a position away from the gear drive mechanism 50, it can reliably prevent the lubricant oil used by the gear drive mechanism 50 from flowing to the disc. Malfunction due to flying of board 51.

In addition, since the first pressing arm 41 that is swing-driven corresponding to the cam shape of the cloth pressing cam 36 and the first thread-drawing arm 54 that is swing-driven corresponding to the cam shape of the thread-drawing cam 53 are supported by a common pivot shaft 40 to support, therefore, compared with the occasion that the pivot shaft is specially arranged as the pressing arm usefulness and the wire pulling cam usefulness, the cloth pressing mechanism 20 and the wire pulling mechanism 52 can be simplified.

In addition, since the presser foot wiper drive motor 32 is fixed to the right side wall portion 31a close to the driven gear 35 in the fixed frame 31, as long as the presser foot wiper drive motor 32 is fixed to the driven gear 35, The adjacent right side wall portion 31a is enough, and the driving gear 33 and the driven gear 35 can be meshed, so that the structure of the gear driving mechanism 50 is simplified.

In addition, since the reference mark M as a reference is set on the cloth pressing cam when the relative position of the cloth pressing cam 36 and the line cam 53 is changed, and the adjustment marks m1 and m2 are set on the line cam 53, it is not only effective Using these marks M, m1, m2 as a reference, and can easily change the relative position of the cloth clamping cam 36 and the wire pulling cam 53, can improve the operability of the changing operation, can realize the quickening of the changing operation.

Modifications of the above-mentioned embodiment will be described below.

1] The driven gear 35 can be integrally formed with the camshaft 34 , or can also be integrally formed with the wire pulling cam 53 . In this case, since the driven gear 35 is included in the camshaft 34 or the wire cam 53, the gear drive mechanism 50 can be simplified and the number of parts can be reduced.

2] The driven gear 35 and the cloth pressing cam 36 can also be formed separately. In this case, the production cost of the driven gear 35 and the cloth pressing cam 36 can be reduced.

3] Also can adopt the image form to represent the thickness of thin material, replace the adjustment mark m1 engraved on the line cam 53, adopt the image form to represent the thickness of thick material, replace adjustment mark m2. In this case, the relative position adjustment of the thread wiper 60 corresponding to the thickness of the sewing material can be simplified.

4] In addition, the structure of the cloth pressing cam and the wire pulling cam part can also adopt the structure shown in Figure 10. That is, the second camshaft 34B is fixed to the fixing frame 31A in addition to the first camshaft 34A. On the first camshaft 34A, the driven gear 35 and the wire cam 53 are arranged, the driven gear 35 is releasably fixed by the fixing screw 37, and the wire cam 53 is releasably fixed by the fixing screw 38. to fix. On the second camshaft 34B, the driven gear 63 and the cloth press cam 36 are arranged integrally, and are fixed in a detachable manner by the fixing screw 39, and the driving gear 33 of the presser foot wiper driving motor 32 is connected to the driven gear 33 respectively. The movable gear 35,63 meshes.

With such a structure, the degree of freedom in distributing the cloth press cam 36 and the wire wiper cam 53 can be enlarged. Here, the gear drive mechanism 50A is constituted by the drive gear 33 , the driven gear 35 , the driven gear 63 , the first and second camshafts 34A, 34B, and the like.

The present invention is not limited to the above-described embodiments, and various modifications can be added within the scope not departing from the gist of the present invention. The device 60 is used for various sewing machines that use the wire removal cam 53 to remove the wire.

Claims (5)

1. Sewing machines has by the compress cam and makes cloth presser that the compress pin moves up and down and make the line device of dialling that the thread end of reaching the standard grade is dialled line carry out and dial the thread-laying mechanism that line moves by dialling line cam, it is characterized in that, comprising:

Common 1 stepping motor that described compress cam and group line cam are driven; And

By a plurality of gears that drive by described stepping motor to described compress cam with dial the gear driven mechanism that line cam drives,

Described gear driven mechanism, have on the output shaft that is fixed in stepping motor driven wheel and to described compress cam with dial the driven gear that line cam drives, the diameter of described driven wheel is less than the diameter of described driven gear,

Described stepping motor and described gear driven mechanism are disposed at the outside portion of upright column sections of establishing on the pedestal part of described Sewing machines,

Described compress cam and group line cam are arranged on the shared camshaft, and described driven gear and this camshaft are affixed, and described camshaft is disposed at the downside of the output shaft of described stepping motor,

Carry out the pressure arm of wobble drive accordingly and dial the line arm with the cam face of described compress cam, support by shared pivot fulcrum with the cam face of described group of line cam carries out wobble drive accordingly,

Be provided with the phase-detection member of the phase place that is used to detect output shaft in a square end portion of the output shaft of described stepping motor, be provided with described gear driven mechanism in the opposing party end of the output shaft of described stepping motor.

2. Sewing machines as claimed in claim 1 is characterized in that, has adopted the structure of phase position of the relativity of variable described compress cam and described group of line cam.

3. Sewing machines as claimed in claim 2 is characterized in that, as the mark of benchmark, is arranged at least one side in the described compress cam and the described group of line cam during with the phase position change of the relativity of described compress cam and described group of line cam.

4. Sewing machines as claimed in claim 1 is characterized in that, at least one side in described driven gear and described compress cam and the described group of line cam is integrally formed.

5. Sewing machines as claimed in claim 1 is characterized in that, the cam of close driven wheel one side in described driven gear and described compress cam and the described group of line cam is integrally formed.

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