JPH1176668A - Sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sewing machine reducing a size and a cost by miniaturizing and simplifying the driving system of sending teeth and a thread acquiring means and omitting the adjustment of the forward/backward sending timing and upward/downward sending timing of the sending teeth so as to simplify assembling work. SOLUTION: A synthetic resin cam body 30 is constituted by forming a forward/backward driving cam at an upper stage part, a timing pulley 32 at a medium stage and an upward/downward driving cam 33 at a lower stage. The cam 33 among them is provided with an annular cam surface 35 for sending and driving the sending teeth forward/backward on a tip surface nearly orthogonal with the shaft center of a driving shaft 6 and an annular suspending surface 36 contained in a surface orthogonal with the shaft center of the shaft 6 to suspend the forward/backward moving of the sending teeth.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewing machine, and more particularly, to an annular cam surface for vertically driving a feed dog on an end surface substantially perpendicular to an axis of a drive shaft, and a surface perpendicular to the axis of the drive shaft. A cam body is integrally formed concentrically with an annular rest surface for suspending the vertical movement of the feed dog, and a front-rear drive cam for driving the feed dog back and forth, and a thread catcher The present invention relates to a device in which a timing pulley for driving means is integrally formed.

[0002]

2. Description of the Related Art A general industrial sewing machine and a household sewing machine include a sewing machine motor, a main shaft (upper shaft) rotationally driven by the sewing machine motor, a needle bar vertical movement mechanism for driving a needle bar up and down, A feed dog front-rear drive mechanism for driving the feed dog back and forth, a feed dog vertical drive mechanism for driving the feed dog up and down, and a rotary hook (thread catching means) which operates in synchronism with a sewing needle to form a thread loop of an upper thread ) Etc. are provided.

Conventionally, in order to drive a feed dog longitudinal drive mechanism and a feed dog vertical drive mechanism, a lower shaft is rotationally driven via a drive shaft (vertical axis) which is rotationally driven by a main shaft, and the lower shaft is driven longitudinally. A cam and an up-down drive cam are mounted, and the feed dog is driven up-down and up-down by a front-back drive cam and an up-down drive cam, respectively, via a link mechanism. In some cases, the drive transmission member is oscillated by the rotation of the main shaft, and the feed dog is driven up and down by the oscillation of the drive transmission member.

Further, as a shuttle drive mechanism for driving a conventional rotary shuttle (thread catching means), a timing pulley is fixedly attached to the rotary hook and the drive shaft, and a timing belt is mounted on these timing pulleys to drive the drive shaft. Is transmitted to a rotary hook via a timing pulley and a timing belt to drive the rotary hook. Further, a timing pulley on the drive shaft side and an up-down drive cam are integrally formed, and the up-down drive cam drives the feed dog back and forth in practical use (see Japanese Patent Publication No. 63-64235).

Recently, an embroidery sewing machine provided with an embroidery device that can be attached to and detached from a bed has been widely put into practical use. When embroidery sewing is performed with this type of embroidery sewing machine, the embroidery device is mounted on the bed and Since the embroidery frame on which the work cloth is mounted is set on the bed surface and the embroidery frame is driven back and forth and left and right by the embroidery device, the embroidery is sewn on the work cloth. In such a case, in order to prevent interference between the feed dog and the embroidery frame and noise due to the feed dog feed operation, it is desirable not to feed the feed dog.

In the sewing machine disclosed in Japanese Patent Publication No. 63-64235, a cam portion and a true circular portion (inoperative cam portion) are formed around an outer periphery of a vertical drive cam integrally formed with a timing pulley on the rotary hook side. A follower of a feed dog vertical drive mechanism, which is formed in series in the direction of the dynamic axis and is selectively engageable with the cam portion and the perfect circle portion, is provided. , And can be switched between an operating position in which the feed dog engages with the cam portion to move up and down and a non-operation position in which the feed dog engages with the perfect circle portion and does not move up and down. .

In the sewing machine disclosed in Japanese Patent Publication No. 59-33340, an up-down driving cam that engages with a base end of a feed base is provided.
An operating position in which the vertical drive cam is mounted on the drive shaft so as to be movable in the axial direction thereof, moves the vertical drive cam in the axial direction of the drive shaft, and engages with the base end of the feed base to vertically operate the feed dog. The feed dog is disengaged from the base end and can be switched over to an inoperative position where the feed dog is not operated up and down.

[0008]

[Problems to be Solved by the Invention] JP-B-63-642
In the sewing machine disclosed in Japanese Patent Publication No. 35-35, the cam portion and the perfect circle portion of the vertical drive cam are formed in series on the outer peripheral portion of the vertical drive cam in the direction of the rotation axis thereof. As the size increases in the direction of the center, the drive system of the feed dog increases in size and the manufacturing cost increases. In the sewing machine disclosed in Japanese Patent Publication No. 59-33340, the vertical drive cam is relatively large in the axial direction of the drive shaft due to its configuration, and a space for moving the vertical drive cam in the axial direction of the drive shaft is also required. Therefore, as in the above-mentioned publication, the drive system of the feed dog becomes large, and its manufacturing cost becomes high.

On the other hand, in a conventional sewing machine in which the vertical drive cam, the front-rear drive cam, and the shuttle driving pulley are separately provided and are scattered and arranged in the bed portion, the drive system of the feed dog and the rotary hook is a component. Larger and more complex due to the increase in points,
The assembling work becomes difficult, and the production cost becomes high. Further, when assembling the separate vertical drive cam, front-rear drive cam, and shuttle drive pulley, their phases must be adjusted.

In the sewing machine disclosed in Japanese Patent Publication No. 63-64235, there is a problem that the vertical drive cam is enlarged in the direction of the axis of the drive shaft, and the cam body and the front-rear drive cam are formed separately. As described above, the drive system of the feed dog and the rotary hook is increased in size and complexity due to the increase in the number of parts, and the assembling work becomes difficult, the manufacturing cost becomes expensive, and when assembling the cam body and the front and rear drive cam, , Their phase must be adjusted.

SUMMARY OF THE INVENTION It is an object of the present invention to reduce and simplify the drive system of the feed dog and the yarn catching means, to omit the adjustment of the forward and backward feed timing and the vertical feed timing of the feed dog, to simplify the assembling work, and to reduce the size. And a cost-effective sewing machine.

[0012]

According to a first aspect of the present invention, there is provided a sewing machine including a feed dog front-rear drive mechanism for driving a feed dog back and forth, a feed dog up-down drive mechanism for driving a feed dog up and down, a sewing needle and a timing operation. And a thread catching means for forming a thread loop of the upper thread, wherein the drive shaft is connected concentrically and non-rotatably with a drive shaft interlocked with a main shaft driven by a sewing machine motor, A cam body in which an annular cam surface on an end surface substantially orthogonal to the center and an annular rest surface included in a surface orthogonal to the axis of the drive shaft are integrally formed concentrically, and included in the feed dog vertical drive mechanism And a follower interlockingly connected to the feed dog, the follower being capable of being selectively engaged with the cam surface and the rest surface of the cam body, and the follower being moved in a direction orthogonal to the axis of the drive shaft. Moving and moving the feed dog up and down by engaging with the cam surface and the rest surface It is a follower switching mechanism to switch the tooth feed over to the inoperative position which does not operate in the vertical ones equipped with.

Here, in the cam body, the cam surface may be configured to have a larger diameter than the rest surface, that is, located on the outer peripheral side, or the cam surface may be smaller than the rest surface, that is, located on the drive shaft side. It may be configured as follows. The follower switching mechanism makes it possible to easily switch the follower between the operating position and the non-operating position, and when the follower is located at the operating position and engaged with the cam surface of the cam body, the cam body is rotationally driven. The follower is driven by the cam surface, and the feed dog is driven up and down by the vertical drive mechanism.

Further, when the cam body is driven to rotate while the follower is located at the inoperative position and is engaged with the rest surface of the cam body,
Since the follower is not driven, the feed dog is not driven up and down and stops. Here, in a state where the follower is located at the non-operation position and is engaged with the rest surface of the cam body, it is desirable that the feed dog is located below the needle plate. In particular, the sewing machine is an embroidery sewing machine. In some cases, mutual interference between the embroidery frame set on the bed surface and the feed dog can be reliably prevented.

According to a second aspect of the present invention, there is provided the sewing machine according to the first aspect, wherein the cam body is integrally formed with a front-rear drive cam having a cam surface formed on an outer peripheral portion for driving the feed dog back and forth. It is assumed that. Since the front and rear driving cams are integrally formed on the cam body, and a driving system for individually driving the vertical driving cam and the front and rear driving cam can be omitted, the feed dog front and rear driving mechanism and the feed dog vertical driving mechanism can be reduced in size and simplified. It is not necessary to adjust the vertical movement timing and the front-back movement timing of the feed dog. Other operations are the same as those of the first aspect.

A sewing machine according to a third aspect of the present invention is the sewing machine according to the first or second aspect, wherein a timing pulley for rotationally driving a rotation input portion of the thread catching means is integrally formed with the cam body. is there. Since a timing pulley is formed integrally with the cam body, a drive system for individually driving the vertical drive cam, the front-rear drive cam, and the timing pulley can be omitted,
The feed dog front-rear drive mechanism, the feed dog vertical drive mechanism, and the shuttle drive mechanism that drives the yarn catching means are reduced in size and simplified. Other operations are the same as those of the first or second aspect.

Here, for example, the front-rear drive cam, the vertical drive cam, and the timing pulley may be formed on the upper, middle, and lower portions of the cam body, respectively. In this case, the cam body can be integrated into a three-layer structure in which the driving cam and the timing pulley are in close contact with each other, so that the cam body is very compact and its rigidity is increased. Further, it is desirable to form the front-rear drive cam, the timing pulley, and the upper-lower drive cam so as to increase in diameter in this order, and this is advantageous in that when the cam body is manufactured by injection molding, die cutting is simplified. .

According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the follower is provided at a tip end of a link member for vertically driving the feed dog in a direction perpendicular to the axis of the drive shaft. The follower switching mechanism is movably mounted in a direction orthogonal to the moving direction of the follower by the link member being elastically urged to one of the operating position and the inoperative position by an elastic member. Operating member, and is configured to switch the follower from one of an operating position and a non-operating position to the other by opposing the elastic biasing force of the elastic member through movement of the operating member. .

The operating member may be manually operated by an operator or, when the sewing machine is an embroidery sewing machine, may be operated when the embroidery device is mounted on the bed. The follower is elastically biased to one of an operating position and a non-operating position by an elastic member, and when the operating member is operated and moves in a direction orthogonal to the moving direction of the follower, the follower moves through the elasticity of the elastic member through the movement. Switching from one of the active position and the inactive position to the other, against the biasing force. In addition, the same operation as any one of the first to third aspects is achieved.

According to a fifth aspect of the present invention, in the invention of the fourth aspect, a tapered surface is formed on an outer peripheral edge of the follower, and an inclined portion is formed to engage with the tapered surface of the driven member. It is characterized by the following. When the operating member moves in a direction orthogonal to the moving direction of the follower, the inclined portion of the operating member engages with the tapered surface of the follower, and the follower is pushed against the elastic biasing force of the elastic member, and the operation is performed. The position and the inoperative position are switched from one to the other. Since the tapered surface of the follower engages with the inclined portion of the operation member, wear of the operation member and the follower can be prevented as much as possible. Other operations are the same as those of the fourth aspect.

[0021]

Embodiments of the present invention will be described below with reference to the drawings. In the present embodiment, the present invention is applied to an embroidery sewing machine capable of performing embroidery sewing. As shown in FIG. 1, the embroidery sewing machine M includes a bed 1 and a bed 1.
And an arm 3 extending leftward from the upper end of the pillar 2 so as to face the bed 1.

The sewing machine motor 4 is provided inside the embroidery sewing machine M.
A spindle 5 driven to rotate by the sewing machine motor 4;
, A needle bar vertical movement mechanism 7 that drives the needle bar 20 up and down, a feed dog front-rear drive mechanism 8 that drives the feed dog 40 back and forth, and drives the feed dog 40 up and down. And a hook driving mechanism 10 for driving a rotary hook 90 (thread catching means) for forming a thread loop of the upper thread by operating in synchronism with the sewing needle 22.

The main shaft 5 is disposed in the arm portion 3 in the left-right direction, and is rotatably supported by a pair of ball bearings 5a mounted on a die-cast frame 15. A timing pulley 16 is fixed to a right end portion of the main shaft 5, and a timing belt 18 is mounted on the timing pulley 16 and a timing pulley 17 fixed to an output shaft of the sewing machine motor 4, and the main shaft 5 is driven by the sewing machine motor 4. , Are driven to rotate in a predetermined rotation direction via both timing pulleys 16 and 17 and a timing belt 18.

In the head 3a at the left end of the arm 3,
A needle bar support 21 whose upper end is pivotally supported by the frame 15 is provided so as to be swingable right and left.
0 is supported movably up and down. A sewing needle 22 is attached to the lower end of the needle bar 20, the needle bar vertical movement mechanism 7 and the shuttle drive mechanism 10 operate synchronously, and the sewing needle 22 and the rotary hook 90 operate in a timely manner, so that A seam is formed.

To explain the needle bar vertical movement mechanism 7, a crank member 23 is fixed to the left end of the main shaft 5, the upper end of the crank lever 24 is pin-connected to the crank member 23, and the lower end of the crank lever 24 is The needle bar 20 is connected to the middle portion. Thus, when the main shaft 5 is rotationally driven by the sewing machine motor 4, the needle bar 20 is driven up and down via the crank member 23 and the crank lever 24.

The drive shaft 6 is disposed vertically in the pillar 2,
It is rotatably supported by a pair of ball bearings 6a attached to the frame 15. Bevel gear 2 at the upper end of drive shaft 6
The bevel gear 25 is fixedly engaged with the bevel gear 25, and the bevel gear 26 externally fixed to the main shaft 5 meshes with the bevel gear 25.
As a result, the drive shaft 6 is linked to the main shaft 5. still,
The bevel gear 26 is fixed to the main shaft 5 by a set screw 26a.

Next, a description will be given of the cam body 30 attached to the lower end of the drive shaft 6 concentrically with the drive shaft 6 so as not to rotate relative thereto, with reference to FIGS. The cam body 30 is made of synthetic resin, and includes a front-rear drive cam 31 for driving the feed dog 40 forward and backward, and a timing pulley 32 for rotating and driving a rotary hook 90 that rotates about a vertical axis. An upper and lower drive cam 33 for driving the feed dog 40 up and down is formed integrally with the lower part in the middle part, and an insertion hole 34 penetrating vertically is formed in the center part. The lower end of the drive shaft 6 is fitted into the hole 34 and the pin 3
Oa is fixed so as not to rotate relatively.

The front-rear drive cam 31 is formed in a substantially fan shape in a plan view, and a cam surface 31a for driving the feed dog 40 forward and rearward is formed on the outer peripheral portion thereof. Timing pulley 32
Is formed larger in diameter than the large diameter portion of the front and rear drive cam 31. The vertical drive cam 33 has an annular cam surface 35 on an end surface substantially orthogonal to the axis of the drive shaft 6 and an annular rest surface 36 included in a surface orthogonal to the axis of the drive shaft 6. The diameter of the outer periphery of 33 is formed larger than the diameter of the timing pulley 32. That is, the outer peripheral portions of the front and rear driving cam 31, the timing pulley 32, and the vertical driving cam 33
The diameter is increased in this order.

The cam surface 35 and the rest surface 3 of the vertical drive cam 33
The cam surface 35 is formed so as to be concentric with the axis of the drive shaft 6 as a center. The cam surface 35 is configured to have a larger diameter than the rest surface 36, that is, on the outer peripheral side. The plane perpendicular to the axis of the shaft 6) is formed in the same plane as the rest plane 36. The front and rear driving cam 31 and the cam surface 35 of the vertical driving cam 33 are connected to the feed dog front and rear driving mechanism 8.
And the feed dog vertical drive mechanism 9,
It is formed in a shape that can execute a normal four-feed operation of “0” at a predetermined timing.

Next, a feed dog 40 provided on the left side of the bed 1, a feed dog front-rear drive mechanism 8, a feed dog vertical drive mechanism 9, a rotary hook 90 provided near the feed dog 40, a hook drive mechanism 10 will be described with reference to FIGS.

The feed dog 40 includes a pair of horizontal support plates 41.
a, 41b are attached to the upper end of a feed base 41 in which two upper and lower layers are connected. A pair of support plates 41 of the feed base 41
A vertical pivot pin 42 is inserted through the vertical pivot pins 42 a and 41 b so as to be vertically movable. The central portion of the pivot pin 42 is fixed to the left end of the pivot member 51. 41
Is driven back and forth. An extension 42c extends forward from the lower support plate 41b, and projects upward from a horizontal support plate 43 attached to the frame 15 into an elongated hole 42d formed at the front end of the extension 42c. The engaging pin 44 engages, and the rotation of the feed base 41 is restricted so as to reciprocate back and forth.

The oscillating member 51 is formed by connecting a pair of horizontal oscillating plates 51a and 51b in upper and lower two layers and is formed in a substantially U-shape when viewed from the side, and the right ends of the oscillating plates 51a and 51b are framed. 15 is pivotally supported by a vertical pivot shaft 52 fixed thereto.
Below the left end of the swinging plate 51a, a horizontal plate 51c integral with the swinging member 51 protrudes opposite to the swinging plate 51a, and is attached to the left end of the swinging plate 51a and the horizontal plate 51c by the pivot support. Pin 42
Is inserted, and the central portion thereof is fixed.

The feed dog front-rear drive mechanism 8 includes a drive shaft 6, a front-rear drive cam 31 of a cam body 30 fixed to the drive shaft 6,
Forward / backward feed link member 50 engaged with front / rear drive cam 31
And a swinging member 51 rotatably connected to the left end of the forward and backward feed link member 50. Forward / reverse link member 50
Is formed in a substantially elliptical plate shape in plan view, is disposed substantially at the center of the bed portion 2 at the height of the front-rear drive cam 31, and is provided with a feed adjustment at the right end of the front-rear feed link member 50. The square piece 56 of the container 55 is pin-connected.

A driving portion 50a having a rear end portion bent downward is integrally formed at an intermediate portion of the longitudinal feed link member 50 in the longitudinal direction. The drive unit 5 of the forward / backward link member 50
The portion on the right side of 0a is urged rearward by the tension coil spring 53, and the urging force of the tension coil spring 53 presses the drive portion 50a of the forward / reverse feed link member 50 against the cam surface 31a of the front / rear drive cam 31 from the front. Abut.

The feed adjuster 55 is for adjusting the feed amount of the feed dog 40 in the front-rear direction.
A square piece 66 pin-coupled to the right end of the bracket, and an adjuster body 57 for movably engaging the square piece 66.
Is rotated about the pivot pin 57a, and the feed adjuster body 5 is rotated.
By changing the posture of 7, ie, the reciprocating direction of the square piece 56, the feed amount of the feed dog 40 in the front-rear direction can be adjusted.

FIGS. 7 to 9 show a state in which the feed dog 40 is adjusted to a predetermined feed amount by the feed adjuster 55 in the front-rear position, the feed dog 40 is positioned at the forefront position, a substantially middle position in the front-rear direction, respectively. The state at the rearmost position is shown.

When the drive shaft 6 is rotated in the direction of the arrow from the state shown in FIG. 7, the front-rear drive cam 31 engaged with the drive portion 50a is formed.
Moves to the smaller diameter side, and the front-rear drive link member 50 urged by the tension coil spring 53 swings rearward. At this time, since the square piece 56 moves obliquely rearward and leftward, the leftward movement component of the front-rear drive link member 50 acts on the swinging member 51, and the swinging member 51 rotates in the arrow direction (clockwise). ,
The feed dog 40 is driven backward. At this time, the feed dog 4
Numeral 0 is positioned above a needle plate (not shown) by the feed dog vertical drive mechanism 9.

When the drive shaft 6 is rotated in the direction of the arrow from the state shown in FIG. 9, the front-rear drive cam 31 engaged with the drive section 50a moves to the large diameter side, and the front-rear drive cam 31 drives the front-rear drive cam 31 forward and backward. The link member 50 is pushed and swings forward. At this time, since the square piece 56 moves diagonally forward and rightward, the rightward movement component of the front-rear drive link member 50 acts on the swing member 51, and the swing member 51 rotates in the direction of the arrow (counterclockwise). Then, the feed dog 40 is driven forward. At this time, the feed dog 40 is located below the needle plate by the feed dog vertical drive mechanism 9.

The feed dog vertical drive mechanism 9 includes a drive shaft 6, a vertical drive cam 33 of a cam body 30 fixed to the drive shaft 6,
A follower 60 that can be selectively engaged with the cam surface 35 and the rest surface 36 of the vertical drive cam 33, and the follower 60 is operatively connected to the right end and horizontally connected to the frame 15 via an eccentric pivot mechanism 61. Vertical feed link member 6 pivotably supported around an axis.
2 and a follower switching mechanism 63 for switching the follower 60 between an operating position where the follower 60 is engaged with the cam surface 35 and an inoperative position where the follower 60 is engaged with the rest surface 36.

The vertical feed link member 62 is formed in a substantially elliptical plate shape when viewed from the front, and is disposed vertically at a substantially central portion of the bed portion 2 in the front-rear direction on the rear side of the front-rear feed link member 50. A roller 6 is provided at the left end of the vertical feed link member 62.
5 is rotatably connected, and the lower surface of the support plate 41 b of the feed base 41 is in contact with and supported by the rollers 65. here,
A compression coil spring 66 is provided on the pivot pin 42 between the support plate 41b and the horizontal plate 51c of the swinging member 51. The urging force of the compression coil spring 66 causes the feed base 41 to always press the roller 65 from above. The feed dog 40 has a roller 65
It is configured to move up and down following the up and down movement of.

The eccentric pivot mechanism 61 will be briefly described with reference to FIG. 8. A cylindrical stepped collar 67 is rotatably fitted into a pivot support hole 62a at an intermediate portion in the longitudinal direction of the vertical feed link member 62. The stepped collar 67 is fixed to the boss 15a of the frame 15 with a set screw 68. The set screw 68 is screwed into a position eccentric from the axis of the stepped collar 67. By loosening the set screw 68 and rotating the stepped collar 67, the pivot shaft of the vertical feed link member 62 is rotated. The center is eccentric, and the height position of the vertical movement range of the feed dog 40 can be adjusted.

The follower 60 and the follower switching mechanism 63 will be described. As shown in FIGS.
Has an engaging surface 60a formed on the outer peripheral portion thereof for engaging with the vertical drive cam 33 of the cam body 30, and a tapered surface 60b formed on the outer peripheral edge of the rear end of the engaging surface 60a. A horizontal pin 70 fixed to the right end of the vertical drive link member 62 and protruding forward is externally movably fitted in the front-rear direction, and is selectively engageable with the cam surface 35 and the rest surface 36. . A ring member 71 is externally fitted to the pin 70 on the front side of the follower 60 and is prevented from coming off by a stop ring 72 fixed to the front end of the pin 70. Pin 7
At 0, a compression coil spring 73 is provided between the follower 60 and the ring member 71, and the follower 60 is urged rearward by the compression coil spring 73.

As shown in FIGS. 10 and 11, the follower switching mechanism 63 is provided at the right end of the vertical drive link member 62.
An operating member 80 is provided movably in the left-right direction (the direction orthogonal to the moving direction of the follower 60). A pin 81 projecting forward on the left side of the pin 70 and having a smaller diameter than the pin 70 is attached to the vertical drive link member 62.
0 has a guide hole 8 long in the left-right direction into which the pin 70 is inserted.
2 and a guide hole 83 long in the left-right direction into which the pin 81 is inserted.
Are formed in communication with each other, and the operating member 80 is
0a is brought into contact with the vertical drive link member 62, and the pins 70,
Guided by 81, it is mounted movably in the left-right direction.

A first positioning portion 84 having a predetermined front and rear thickness is formed at the right end portion of the operating member 80. Under the guide hole 83 at a substantially central portion of the operating member 80, the first positioning portion 84 is located forward of the first positioning portion 84. A protruding second positioning portion 85 is formed, and the first and second positioning portions 84 and 85 are formed below the guide hole 82.
And an inclined portion 86 that engages with the tapered surface 60b of the follower 60 is formed.

With the pin 70 engaged with the right end of the guide hole 82, the first positioning portion 84 is
2 and the follower 60, the follower 60 is positioned at an operating position where the follower 60 is engaged with the cam surface 35 of the cam body 30 (see FIG. 12), and a pin 81 is engaged with the left end of the guide hole 83. In the combined state, the second positioning portion 85 is interposed between the vertical drive link member 62 and the follower 60, and the follower 60 is positioned at the inoperative position where the follower 60 is engaged with the rest surface 36 of the cam body 30. (See FIG. 13). However, the follower 60 and the pin 70 are configured with appropriate diameters so that the pin 70 does not contact the cam surface 35 when the follower 60 is in the inoperative position.

An operation lever 87 is provided at the left end of the operation member 80 and extends rearward. The operation lever 87 moves the operation member 80 in the left-right direction. FIG.
As shown in FIG. 7, when the operating member 80 is moved rightward from the state where the follower 60 is in the operating position where the follower 60 is engaged with the cam surface 35 of the cam body 30, the operating member 80 is moved to the tapered surface 60b of the follower 60. 1 and the follower 60 is pushed forward and moves against the elastic biasing force of the elastic member.
The position is switched to the inoperative position as shown in FIG.

FIG. 4 shows a state in which the follower 60 is engaged with a substantially horizontal surface of the cam surface 35 and the feed dog 40 is located at a substantially lower limit position below a needle plate (not shown). The state where the follower 60 is engaged with the convex portion of the cam surface 35 and the feed dog 40 is located at the upper limit position above the needle plate is shown. When the drive shaft 6 is rotated in the direction of the arrow from the state shown in FIG.
The cam surface 35 which engages with the convex portion moves to the convex portion side, the vertical drive link member 62 rotates clockwise centering on the eccentric pivot support mechanism 61 in a front view, and the feed dog 40 and the feed
It is driven to rise.

When the drive shaft 6 is rotated in the direction of the arrow from the state shown in FIG. 6, the cam surface 35 engaging with the follower 60 shifts to the horizontal plane, and the vertical drive link member 62 is eccentrically pivoted. The feed dog 40 rotates counterclockwise around the mechanism 61 as viewed from the front, and the feed dog 40 is driven down together with the roller 65 and the feed base 41. In this way, by the cooperation of the feed dog front / rear drive mechanism 8 and the feed dog vertical drive mechanism 9, the feed dog 40 performs a normal four feed operation in synchronism with the vertical movement of the needle bar 20, and the feed adjuster. The work cloth is fed in accordance with the feed amount adjusted in 55.

As shown in FIGS. 5 and 8, the rotary hook 90 is
Vertical hook shaft 91 having a lower end fixed to frame 15
, Which are rotatably supported about a vertical axis. The shuttle drive mechanism 10 will be described. A timing pulley 92 (which corresponds to a rotation input unit) is integrally formed below the rotary hook 90, and a timing belt 93 is provided between the timing pulley 92 and the timing pulley 32 of the cam body 30. When the cam body 30 is driven to rotate with the drive shaft 6, the rotary hook 90 is driven via the timing pulleys 32 and 92 and the timing bed 93.

Due to the difference in the diameter of the timing pulleys 32 and 92, the rotary hook 90 is driven to rotate at twice the rotation speed of the drive shaft 6, and forms a stitch on the work cloth in cooperation with the sewing needle 22. ing. Note that a tension pulley 94 (see FIG. 8) for applying a predetermined tension to the timing belt 93 is provided. By loosening the set screw 26a of the bevel gear 26 and rotating the drive shaft 6 without rotating the main shaft 5, the rotational phase of the drive shaft 6 is finely adjusted with respect to the rotational phase of the main shaft 5. , Rotation phase of rotary hook 90 and feed dog 40
It is possible to finely adjust the timing at which the sewing needle 22 and the blade point (not shown) meet while keeping the vertical and vertical drive timings in a predetermined positional relationship.

The operation and effect of the sewing machine M will be described. An annular cam surface 35 is concentrically connected to a drive shaft 6 operatively connected to the main shaft 5 driven by the sewing machine motor 4 and non-rotatably, and has an end surface substantially perpendicular to the axis of the drive shaft 6.
Since the cam body 30 is integrally formed concentrically with the annular rest surface 36 included in a plane orthogonal to the axis of the drive shaft 6, the cam body 30 is extremely reduced in size.

In addition, the cam body 30 is integrally formed with a front-rear drive cam 31 having a cam surface 31a formed on the outer periphery for driving the feed dog 40 back and forth, and is also a rotation input part of the rotary hook 90. Since the timing pulley 32 for rotating and driving the timing pulley 92 is integrally formed, the feed dog front / rear drive mechanism 8, the feed dog vertical drive mechanism 9, and the shuttle drive mechanism 10
However, since the number of parts can be reduced, miniaturization and simplification are achieved,
The assembling work is also facilitated, and as a result, the size and cost of the entire sewing machine M can be reduced. Also, since the front-rear drive cam 31 and the vertical drive cam 33 are integrally formed,
Adjustment of the vertical movement timing and the forward / backward movement timing of the feed dog 40 becomes unnecessary.

By providing the follower switching mechanism 63, the follower 60 can be easily moved from one of the operation position and the non-operation position to the other through the movement of the operating member 80 against the elastic urging force of the compression coil spring 73. Can be switched, and
Since the tapered surface 60b is formed on the outer peripheral edge of the follower 60 and the inclined portion 86 that engages with the tapered surface 60b of the follower 60 of the operation member 80, wear caused by contact between the operation member 80 and the follower 60 is reduced. It can be prevented as much as possible.

Here, as a modification of the above embodiment,
The following configuration may be adopted. 1) The cam body 30 may be made of metal. 2] The cam body 30 may be connected to a vertical drive shaft provided separately from the drive shaft 6 or a drive shaft arranged horizontally. When the cam body 30 is mounted on a horizontal drive shaft, the cam body 3
0 is rotated about the horizontal axis. By appropriately changing the front-rear drive mechanism, the vertical drive mechanism, and the shuttle drive mechanism, a predetermined operation of the feed dog 40 and the rotary shuttle can be obtained.

3) A cam body in which only the cam surface 35 and the rest surface 36 are integrally formed may be provided, and the front-rear drive cam and the timing pulley for driving the shuttle may be formed separately. Also, cam surface 3
A cam body in which the cam 5, the rest surface 36, and the front and rear drive cam 31 are integrally formed may be provided, and the timing pulley for driving the shuttle may be formed separately. Furthermore, a cam body integrally formed with the cam surface 35, the rest surface 36, and the timing pulley 32 for driving the shuttle is provided.
The front and rear driving cams may be configured separately.

4) In the cam body 30, in the above embodiment, the cam surface 35 is configured to have a larger diameter than the rest surface 36, that is, located on the outer peripheral side. You may comprise so that it may be located in the shaft 6 side. 5) The operation lever 80 may be manually operated by an operator, or may be operated when the embroidery device is mounted on the bed. In the latter case, although not shown, when the operating member 80 is urged to the left by an elastic member and the embroidery device is removed from the bed, the follower 60
May be automatically switched from the inoperative position to the operating position.

6] As shown in FIGS. 14 and 15, a support 95 is fixed or integrally formed at the lower right end of the link member 62A, and the follower switching is performed on the upper surface of the support 95 via a pivot 96. The operating member 80A of the mechanism 63A may be rotatably provided, and the follower 60A may be integrally provided with the distal end of the operating member 80A. The operation member 80A includes an operation lever 87A extending rearward from the vicinity of the pivot shaft 96 and a rotation restricting portion 9 projecting rearward between the pivot shaft 96 and the follower 60A.
7 are integrally formed.

In the case of this modification, not shown,
It is desirable that the operating member 80A be rotated counterclockwise in plan view by an elastic member. When the operating member 80A is not operated, the rotation restricting portion 97 contacts the front surface of the link member 62A, and the operating member 80A is rotated. The rotation of 80A is restricted, and in this state, the follower 60A
When the operation lever 87A is operated clockwise in a front view from this state, the follower 60A rotates together with the operation member 80A, and shifts from the cam surface 35 of the vertical drive cam 33 to the rest surface 36. I do.

7) In the present embodiment, the present invention is applied to an embroidery sewing machine. However, it goes without saying that the present invention can be applied to a lockstitch sewing machine, an industrial sewing machine having a main shaft 5 and a drive shaft 6, and various sewing machines. In addition, the present invention should not be construed as being limited to the above-described embodiment, and may be based on the existing technology or a technology obvious to those skilled in the art without departing from the technical idea of the present invention. And various changes may be made.

[0060]

According to the first aspect of the present invention, an end face which is concentrically and non-rotatably connected to a drive shaft which is linked to a main shaft driven by a sewing machine motor and which is substantially perpendicular to the axis of the drive shaft. The cam body in which an annular cam surface and an annular rest surface included in a surface orthogonal to the axis of the drive shaft are integrally formed concentrically is provided.
Since the number of parts is also reduced, the vertical drive mechanism is reduced in size and simplified, the assembling work is facilitated, and the overall size and cost of the sewing machine can be reduced.

According to the sewing machine of the second aspect, the same effect as that of the first aspect is obtained, but a front-rear drive cam having a cam surface formed on an outer peripheral portion for driving the feed dog back and forth is provided on the cam body. Since they are integrally formed, a drive system for separately driving the vertical drive cam and the front-rear drive cam can be omitted, the vertical drive mechanism and the front-rear drive mechanism can be reduced in size and simplified, and the timing of vertical movement of the feed dog can be reduced. Adjustment of the forward / backward movement timing becomes unnecessary.

According to the sewing machine of the third aspect, the same effect as that of the first or second aspect is obtained, but the timing pulley for rotating and driving the rotation input section of the thread catching means is integrally formed on the cam body. The drive system for individually driving the vertical drive cam, the front-rear drive cam, and the timing pulley can be omitted, and the hook drive mechanism for driving the vertical drive mechanism, the front-rear drive mechanism, and the thread catching means can be reduced in size and simplified.

According to the sewing machine of the fourth aspect, the first to third aspects are provided.
The follower has the same effect as described above, but the follower is movably mounted in the direction perpendicular to the axis of the drive shaft at the tip end of the link member for vertically driving the feed dog, and the operating position is disabled by the elastic member. Elastically biased to one of the positions, the follower switching mechanism includes an operating member movably mounted in a direction orthogonal to a moving direction of the follower of the link member, and controls the follower through movement of the operating member. Since it is configured to switch from one of the operating position and the inoperative position to the other against the elastic urging force of the elastic member, the follower can be easily switched from one of the operating position and the inoperative position to the other.

According to the sewing machine of the fifth aspect, the same effect as that of the fourth aspect is obtained, but the tapered surface is formed on the outer peripheral portion of the follower, and the operating member engages with the tapered surface of the follower. Since the portion is formed, wear due to contact between the operating member and the follower can be prevented as much as possible.

[Brief description of the drawings]

FIG. 1 is a front view showing an internal structure of an embroidery sewing machine according to an embodiment of the present invention.

FIG. 2 is a perspective view of a cam body.

FIG. 3 is a perspective view of the cam body viewed from a bottom surface side.

FIG. 4 is a front view showing the internal structure of the bed.

FIG. 5 is a view corresponding to FIG. 4 including a rotary hook;

FIG. 6 is a front view showing the internal structure of the bed unit.

FIG. 7 is a front view showing the internal structure of the bed unit.

FIG. 8 is a front view showing the internal structure of the bed unit including the rotary hook.

FIG. 9 is a front view showing the internal structure of the bed.

FIG. 10 is a front view of a vertical drive link member, a follower, and a follower switching mechanism.

FIG. 11 is a plan view of a vertical drive link member, a follower, and a follower switching mechanism.

FIG. 12 shows a cam body and a follower (the follower is in an operating position).
FIG.

FIG. 13 is a longitudinal sectional view of a cam body and a follower (the follower is located at an inoperative position).

FIG. 14 is a front view of a vertical drive link member, a follower, and a follower switching mechanism according to a modified embodiment.

FIG. 15 is a front view of the vertical drive link member, follower, and follower switching mechanism of FIG. 14;

[Explanation of symbols]

 M sewing machine 4 sewing machine motor 5 main shaft 6 drive shaft 8 feed dog front and rear drive mechanism 9 feed dog vertical drive mechanism 10 shuttle drive mechanism 22 sewing needle 30 cam body 31 front and rear drive cam 31a cam surface 32 timing pulley 35 cam surface 36 rest surface 40 feed dog 60, 60A Follower 60b Tapered surface 62, 62A Vertical drive link member 63, 63A Follower switching mechanism 73 Compression coil spring 80, 80A Operating member 86 Inclined section 90 Rotary hook 92 Timing pulley

Claims (5)

[Claims] 1. A feed dog front-rear drive mechanism for driving a feed dog back and forth, a feed dog up-down drive mechanism for driving a feed dog up and down, and a thread which operates in synchronization with a sewing needle to form a thread loop of an upper thread. A sewing machine provided with a catching means, wherein an annular cam surface is concentrically connected to a drive shaft interlockingly connected to a main shaft driven by a sewing machine motor so as to be relatively non-rotatable, and has an end surface substantially orthogonal to the axis of the drive shaft. A cam body integrally formed concentrically with an annular rest surface included in a surface orthogonal to the axis of the drive shaft; and a follower included in the feed dog vertical drive mechanism and interlocked and connected to the feed dog. A follower that can be selectively engaged with the cam surface and the rest surface of the cam body; and the follower is moved in a direction orthogonal to the axis of the drive shaft, and engaged with the cam surface to feed. There is an operating position for operating the teeth up and down, and an operating position for engaging the rest surface and not operating the feed dog up and down. And a follower switching mechanism for switching over an operating position. 2. The sewing machine according to claim 1, wherein the cam body is integrally formed with a front-rear drive cam having a cam surface formed on an outer peripheral portion for driving the feed dog back and forth. 3. The sewing machine according to claim 1, wherein a timing pulley for rotationally driving a rotation input section of the thread catching means is formed integrally with the cam body. 4. The follower is movably mounted in a direction perpendicular to the axis of the drive shaft at a tip end of a link member for vertically driving the feed dog and is one of an operating position and a non-operating position by an elastic member. The follower switching mechanism includes an operating member movably mounted in a direction perpendicular to the moving direction of the follower, and the follower switching mechanism is configured to move the follower to the elastic member through the movement of the operating member. The sewing machine according to any one of claims 1 to 3, wherein the sewing machine is configured to switch from one of an operation position and a non-operation position to the other in opposition to the elastic urging force. 5. The sewing machine according to claim 4, wherein a tapered surface is formed on an outer peripheral edge of the follower, and an inclined portion is formed to engage with the tapered surface of the driven member.