JPS6159158B2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a cam selection device for a zigzag sewing machine, and in particular, a cam selection device for a zigzag sewing machine that engages a plurality of pattern cams that are rotated in conjunction with the main shaft of the sewing machine, and any cam among the pattern cams. and a cam follower that imparts a lateral rocking motion to the needle in accordance with the cam shape, and the cam follower is engaged with a pattern cam corresponding to a desired stitch pattern to form the desired stitch pattern. The present invention relates to a cam selection device in a zigzag sewing machine that can be configured to form a cam.

Prior Art In a conventional cam selection device of this type, a manual operating body is rotatably provided outside the sewing machine frame, and when this operating body is rotatably operated, the inclined cam of the dissociation cam is first selected. Due to the action of the surface, the cam follower is disengaged from the pattern cam with which it had been engaged until then, and then, due to the action of the inclined cam surface of the selection cam, the cam follower is disengaged from the pattern cam corresponding to the predetermined stitch pattern. Manual selection of pattern cams is performed through a series of operations in which the cams are moved to opposing positions, and then the action of the dissociation cam is released and the cam follower is engaged with the opposing pattern cam. .

However, in this conventional device, as the number of stitch patterns to be selected increases, the slopes of the inclined cam surfaces of the separating cam and the selection cam become steeper, so the pattern selection is performed by rotating both cams. When doing so, there was a problem in that the rotating operation of the manual operation member became extremely heavy, making it impossible to perform the pattern selection operation smoothly.

In order to solve this problem, an electromagnetic actuating member such as an electromagnetic solenoid is provided to substitute the action of the dissociation cam, and the cam follower is separated from the pattern cam by the action of the electromagnetic actuating member, and the cam follower is kept in that state. proposed a cam selection device that can automatically select pattern cams using the rotational force of a sewing machine motor or a dedicated motor. However, in this cam selection device, a special electromagnetic actuating member such as an electromagnetic solenoid is provided in order to select the pattern cam as described above, so there is a problem that the manufacturing cost of the cam selection device increases. Ta.

Purpose This invention was made in order to solve the above-mentioned problems with the conventional device, and its purpose is to utilize only the rotational force of the sewing machine motor without using electromagnetic actuating parts such as electromagnetic solenoids. It is an object of the present invention to provide a novel cam selection device which can be manufactured at low cost and which can easily and smoothly perform a stitch pattern selection operation by being configured so that a pattern cam can be selected by using a button.

Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. A driven pulley 4 is attached via a clutch mechanism 3 consisting of the following. A sewing machine motor 5 is provided in the lower part of the sewing machine frame 1, and a drive pulley 6 is attached to the motor shaft. Second,
As shown in FIG. 3, a support bracket 7 is provided in the center of the sewing machine frame 1, and first and second rotating shafts 8, 9 are rotatably supported on the support bracket 7. Two intermediate pulleys 11 and 12 integrally connected to a bush 10 are supported at the tip of the first rotating shaft 8 so as to be relatively rotatable. Belts 13 and 14 are hung between the intermediate pulley 12 and the driven pulley 4, respectively.

As shown in Fig. 1, on the front of the sewing machine frame 1 is an operating body 1 for controlling the operation and stopping of the sewing machine.
5 is installed in a switchable manner. Also, the fourth
As shown in FIGS. 5 and 7, a switching lever 16 is rotatably provided in the sewing machine frame 1, and the switching lever 16 is rotatably provided in the sewing machine frame 1.
5 is switched from the sewing machine stop position shown by the solid line in FIG. 1 to the sewing machine operating position shown by the chain line, the 4th,
It is designed to be rotated from the position shown by the solid line in Figures 5 and 7 to the position shown by the chain line. An electric switch (not shown) is provided in the sewing machine frame 1 to control supply and cutoff of electric power to the sewing machine motor 5, and a switching lever 16 is operated based on a switching operation of the operating body 15. When the switch is rotated from the solid line position to the chain line position, this switch is actuated via an appropriate actuation mechanism, power is supplied to the motor 5, and the motor 5 is rotated. In addition, there is a power supply 1 on the front of the sewing machine frame 1.
By selecting and setting the speed setting push buttons 18 in advance, the sewing machine motor 5 is set to the set speed. It is designed to be rotated.

In this embodiment, when the operating body 15 is switched to the sewing machine operation position, the main shaft 2
The clutch mechanism 3 provided between the sewing machine and the driven pulley 4 is in a driving connection state, and the rotation of the sewing machine motor 5 is transmitted to the main shaft 2, so that the sewing machine is operated. Further, when the operating body 15 is switched from the sewing machine operation position to the sewing machine stop position, the switch is reset and the sewing machine motor 5 is shifted to low speed rotation, and then the clutch mechanism 3 is disengaged and the stopper 19 is The main shaft 2 is stopped at a fixed position by the action of a fixed position stopping mechanism including the main shaft 2, and thereafter the sewing machine motor 5 is stopped. Furthermore, as shown in FIG. 1, an operating lever 20 for setting the needle stop position is provided on the front surface of the sewing machine frame 1.
By selecting and setting 0 in advance, the stopping position of the main shaft 2 is determined, and the needle 21 is stopped at the upper position or the lower position.

Note that the mechanism for controlling the operation and stopping of the sewing machine and the mechanism for changing the needle stop position are as follows:
Patent application filed by the same applicant as this invention
The mechanism may be the same as that described in No. 53-98404 (Japanese Unexamined Patent Publication No. 55-24069), and a detailed explanation thereof will be omitted as it is not necessary to understand this invention, but it is necessary. If so, please refer to the above application.

As shown in FIG. 6, a cam shaft 22 and a follower shaft 23 are installed in parallel within the sewing machine frame 1. A plurality of pattern cams 24 and a plurality of feed cams 25 are rotatably supported on the camshaft 22 and are driven to rotate via gears 26 and 27 as the main shaft 2 rotates. First and second follower frames 28 and 29 are rotatably supported on the follower shaft 23, respectively. A pattern cam follower 30 is attached to the follower shaft 23 between both side plates of the first follower frame 28 and can rotate integrally with the first follower frame 28 and move in the axial direction along the follower shaft 23. The needle 21 is supported in such a manner that it can be engaged with any one of the pattern cams 24 to impart a lateral rocking motion to the needle 21 according to the shape of the cam. A feed cam follower 31 is provided on the follower shaft 23 between both side plates of the second follower frame 29 so as to be able to rotate integrally with the second follower frame 29 and along the follower shaft 23 in the axial direction. It is movably supported and engages with any cam in the feed cam 25 to control the feed movement of a feed tooth (not shown) according to the shape of the cam.

As shown in FIGS. 3, 6 and 8, the pattern cam 24 is attached to the first rotating shaft 8 on the support bracket 7.
and each cam follower 30, 3 for the feed cam 25.
A disengagement cam 32 for controlling engagement and disengagement of the disengagement member 1 is supported so as to be relatively rotatable. When the dissociation cam 32 is divided into outer cam surfaces A, B, C, D, E, and F as shown in FIG. is formed so that it is an arcuate displacement cam surface that transitions from a small diameter to a large diameter, an equal radius cam surface with a large diameter between C and E, and an inclined cam surface that transitions from a large diameter to a small diameter between E and F. . By the way, in this example, the rotation angle with A as the original position is 27.5 degrees at B and 132.5 degrees at C.
138° at D, 302.5° at E, and 332.5° at F.

As shown in FIGS. 5 and 6, a release lever 33 is rotatably attached to the support bracket 7 by a pin 34 in correspondence with the release cam 32, and is released via a rotation lever 36 by the action of a spring 35. It is biased to rotate clockwise. A contact pin 37 is protruded from the release lever 33 and is brought into contact with the outer cam surface of the release cam 32 . Also, the release lever 33
A separation plate 38 is fixed on the top so that its position can be adjusted, and a part of the separation plate 38 is attached to the first and second follower frames 2.
8 and 29 in a detachable manner. and,
As the release cam 32 rotates, when the engagement position of the contact pin 37 with respect to the outer cam surface is shifted from the original position A shown in FIG. 8 to the original position D shown in FIG. 8, the release lever 33 is moved from the state shown in FIGS. The pattern cam follower 30 and the feed cam follower 31 are separated from the pattern cam 24 and the feed cam 25 by rotating clockwise and rotating both follower frames 28 and 29 via the separation plate 38. It's getting old.

As shown in FIGS. 3, 6, and 9, the first rotation shaft 8 on the support bracket 7 has the release cam 32.
A selection cam 39 is supported for moving the cam followers 30 and 31 separated from the pattern cam 24 and the feed cam 25 along the rotational axis of the cam, and is inserted into the first rotational shaft 8. The control cam b41 is fixed to the control cam b41 by a pin 40, and is operatively connected to the control cam b41 via a concave-convex engaging portion 42, so as to be rotated integrally with the first rotating shaft 8. This selection cam 39 has a central flange portion 43.
A pattern selection cam 44 is provided on one side of the cam 44 and a feed selection cam 45 is provided on the other side, and the outer cam surfaces of these cams 44 and 45 are provided with a plurality of arcuate cam portions 44a and 44a having different diameters, respectively. 45a and inclined cam portions 44b, 45b connecting the arcuate cam portions 44a, 45a are formed. By the way,
In this embodiment, as shown in FIG. 9, 16 types of arcuate cam portions 44a, 45a are formed, and the rotation angle R between each of the arcuate cam portions 44a, 45a.
is 22.5°, and the rotation angle R of the inclined cam portions 44b and 45b is
1 is 5°, and the rotation angle R2 from the end of the inclined cam portions 44b, 45b to the center of the arcuate cam portions 44a, 45a is 8.75°.

As shown in FIG. 6, a pair of contact levers 4 are mounted on the support bracket 7 on both sides of the selection cam 39.
6 and 47 are each rotatably attached, and the spring 4
8, it is urged to rotate toward the selection cam 39 side. One contact lever 46 is provided with a contact pin 49 that contacts the pattern selection cam 44 on the selection cam 39 and an engagement pin 50 that engages with the pattern cam follower 30. Further, the other contact lever 47 has a feed selection cam 45 on the selection cam 39.
A contact protrusion 51 that contacts the feed cam follower 31 and an engagement pin 52 that engages the feed cam follower 31 are provided. When the selection cam 39 is rotated with the cam followers 30 and 31 being separated from the pattern cam 24 and the feed cam 25 due to the action of the separation cam 32, the pattern selection cam 44 and the feed selection cam 45 are Both contact levers 46, 47 according to the cam shape
are rotated, and each cam follower 30, 31 is moved along the rotation axis of the pattern cam 24 and the feed cam 25.

As shown in FIGS. 3, 6, 8, and 9, a positioning cam 53 is mounted on the first rotation shaft 8 on the support bracket 7 between the separation cam 32 and the selection cam 39.
is supported and operatively connected to the selection cam 39 via the concave-convex engaging portion 54, so that the selection cam 39
It is designed to be rotated integrally with the A plurality of troughs 53a and peaks 53b are alternately formed on the outer periphery of the positioning cam 53 so as to engage with the contact pin 37 on the release lever 33.
The engagement between the valley portion 53a and the contact pin 37 regulates the stop position of the selection cam 39. Incidentally, in this embodiment, as shown in FIG. 9, 16 valleys 53a and peaks 53b are formed alternately, and the rotation angle R between each valley 53a is
22.5°, the rotation angle R3 of the top surface of the peak portion 53b is 6°,
The rotation angle R ₄ from the top end of the peak portion 53b to the valley portion 53a is set to be 8.25°.

As shown in Figures 1, 2 and 6, the sewing machine frame 1
A pattern display board 55 is adhered to the front surface of the screen, and a plurality of shapes 56 (16 types in the embodiment) of stitch patterns that can be formed are attached to the front surface of the board 55. A bracket 57 provided in the sewing machine frame 1 so as to protrude forward through an opening formed at the right end of the pattern display plate 55 has a single selection button 58 for selecting a desired stitch pattern. is supported so that it can be operated by pressing. As shown in FIG.
An actuating lever 59 is rotatably supported by the lever 59, and can be rotated in the counterclockwise direction by pressing the selection button 58. An electric switch 60 is provided in the sewing machine frame 1 near the sewing machine motor 5 to control the supply of electric power to the motor 5, and when the operating lever 59 is rotated by pressing the selection button 58. , transmission lever 61,
When this switch 60 is actuated via the rod 62 and cam lever 63, power is supplied to the sewing machine motor 5 and the motor 5 is rotated at a low speed, and the selection button 58 is released, this switch is activated. 60 is operated to return, and then the sewing machine motor 5 is stopped after a predetermined period of time.

As shown in FIGS. 3 and 4, an intermediate pulley 12 is attached to the first rotating shaft 8 on the support bracket 7.
A planetary gear mechanism 64 is provided adjacent to.
To explain this mechanism 64 in detail, a sun gear 65 is formed at the end of the bush 10. A cylindrical control body 6 is mounted on the bush 10.
6 is supported for relative rotation, and an internal gear 67 corresponding to the sun gear 65 is formed on its inner circumferential surface, and a plurality of notches 68 are formed on its outer circumferential surface. A disc-shaped carrier 69 is supported on the first rotating shaft 8 adjacent to the bush 10 so as to be relatively rotatable, and the sun gear 6 is mounted on one side of the carrier 69.
5 and two planetary gears 7 meshing with the internal gear 67
0 is rotatably supported.

As shown in FIG. 4, a transmission control lever 72 is rotatably attached to the support bracket 7 by a stepped screw 71 corresponding to the control body 66, and
3, it is urged to rotate counterclockwise. A stopper 74 is provided at one end of the transmission control lever 72.
is provided and is adapted to engage with the support bracket 7 to restrict rotation of the transmission control lever 72 at a predetermined position due to the action of the spring 73. Further, at the other end of the transmission control lever 72, an engaging portion 75 that can be engaged with and disengaged from the notch 68 of the control body 66 is provided protrudingly, and a leaf spring 76 that is capable of being engaged with and disengaged from the switching lever 16 is attached. .

When the operating body 15 is in the sewing machine stop position shown by the solid line in FIG. 1 and the switching lever 16 is in the solid line position in FIG. is held at the solid line position in the same figure, and its engaging portion 75 is connected to the control portion body 66.
The control member 66 is engaged with the notch 68 of the control member 66 to restrict clockwise rotation of the control member body 66. Therefore, in this state, if the sewing machine motor 5 is rotated by pressing the selection button 58,
As the sun gear 65 rotates counterclockwise, the two planetary gears 70 are rotated clockwise and revolved counterclockwise together with the carrier 69, and the rotation is transmitted to the carrier 69.

Further, when the operating body 15 is switched to the sewing machine operating position shown by the chain line in FIG. 1 and the switching lever 16 is rotated to the chain line position in FIG. The engaging portion 75 is rotated to the chain line position in the figure, and the engaging portion 75 is rotated to the position indicated by the chain line in the figure.
6 is released from the notch 68, and the control body 66 is released from the restrained state. Therefore, when the sewing machine motor 5 is rotated in accordance with the switching operation of the operating body 15 in this state, the rotation of the sun gear 65 in the counterclockwise direction causes the rotation of the sewing machine through the two planetary gears 70 and the internal gear 67. The control body 66 is rotated clockwise, and the rotation is not transmitted to the carrier 69.

Between the carrier 69 and the dissociation cam 32,
A first driving connection means is provided which includes a first clutch means 77 for driving and connecting both 69 and 32 so as to be able to come into contact with and separate from them. First, the first clutch means 77 will be described in detail. As shown in FIGS. 3, 5, and 10, a drive shaft cylinder 78 is supported on the second rotating shaft 9 on the support bracket 7 so as to be relatively rotatable. ,
As the carrier 69 rotates, the gears 79, 8
0 in the clockwise direction in FIG. 5 at a reduction ratio of 1/2. A driven shaft cylinder 81 is inserted into the second rotating shaft 9 adjacent to the driving shaft cylinder 78 and is fixed to the second rotating shaft 9 by a pin 82 . A clutch spring 83 is wound around both shaft cylinders 78 and 81, and one end of the clutch spring 83 is locked to the driven shaft cylinder 81. A rotating cylindrical body 84 is provided on the outer periphery of the clutch spring 83.
A locking groove 85 for locking the other end of the clutch spring 83 is formed on one side thereof, and a notch 86 is formed on the outer peripheral surface.

When the drive shaft cylinder 78 is rotated clockwise in FIG. If slippage occurs in the drive shaft barrel 78 and the rotation of the drive shaft barrel 78 is not transmitted to the driven shaft barrel 81 and the rotating barrel body 84 is released from the restrained state, the clutch spring 83 and the rotating barrel body 84 are not driven. It is rotated integrally with the shaft cylinder 78, and the rotation is transmitted to the driven shaft cylinder 81. Further, a gear 87 constituting a part of the first drive coupling means is fixed to the end of the second rotating shaft 9, and meshes with a gear 88 on the dissociation cam 32. Therefore, the rotation of the drive shaft cylinder 81 is caused by the rotation of the second rotation shaft 9 and the gear 8.
7 and 88 to the release cam 32, and the release cam 32 is rotated counterclockwise in FIG. 8 at a reduction ratio of 1/2 relative to the carrier 69.

As shown in FIGS. 2, 5, and 10, a two-arm release control arm 90 is rotatably supported on the support bracket 7 by a pin 89 in correspondence with the rotary cylinder 84 of the first clutch means 77. 5, and is biased to rotate counterclockwise in FIG. 5 by the action of a spring 91.
The rotary cylindrical body 8 is attached to both arm portions of the dissociation control arm 90.
A pair of engaging portions 92 and 93 are provided that can alternately engage and disengage from the notches 86 of No. 4, and as shown in FIG. Rotation of the cylindrical body 84 is restricted. Further, as shown in FIG. 2, a connecting spring 94 is hung between one arm of the dissociation control arm 90 and the operating lever 59, and rotates the dissociation control arm 90 in conjunction with the operating lever 59. It's designed to move.

Therefore, when the operating lever 59 is rotated counterclockwise from the state shown in FIG. 2 by pressing the selection button 58, the dissociation control arm 90 is moved from the state shown in FIG. , one of the engaging portions 92 is disengaged from the notch 86, and the rotary cylinder body 84 is released from the restrained state. As a result, the rotation of the sewing machine motor 5 based on the pressing operation of the selection button 58 is transmitted to the release cam 32 via the first drive coupling means including the first clutch means 77, and the release cam 32 is rotated as shown in FIG. The cam followers 30 and 31 shown in FIG. 6 are separated from the pattern cam 24 and the feed cam 25 by the cam action. When the rotating cylinder 84 is rotated by a predetermined angle clockwise from the state shown in FIG. 5, the other engaging portion 93 of the dissociation control arm 90 engages with the notch 86, as shown in FIG. The rotation of the rotating cylinder 84 is restricted,
Both the followers 30,
The dissociated state of 31 continues.

Incidentally, in this embodiment, both engagements with the notches 86 are made so that the rotation of the dissociation cam 32 is stopped when the dissociation cam 32 is rotated 138 degrees from the original position A to the position D in FIG. Part 92,
93 engagement/disengagement positions are set.

On the other hand, a second driving connection means including a second clutch means 95 for drivingly connecting the carrier 69 of the planetary gear mechanism 64 and the selection cam 39 so as to connect and separate them is provided. There is. First, the second clutch means 95 will be described in detail. As shown in FIGS. 3, 5, and 10, a drive shaft cylinder 96 is integrally formed with the carrier 69, and the drive shaft cylinder 96 is rotated counterclockwise in FIG. 5 along with the carrier 69. It is now being rotated to A driven shaft cylinder 97 is supported on the first rotating shaft 8 adjacent to the drive shaft cylinder 96 so as to be relatively rotatable. A clutch spring 98 is wound around both shaft cylinders 96 and 97, and one end of the clutch spring 98 is connected to the driven shaft cylinder 97.
It is locked to. A rotating cylindrical body 99 is loosely fitted around the outer periphery of the clutch spring 98, and a locking groove 100 for locking the other end of the clutch spring 98 is formed on one side of the rotary cylinder body 99.
is formed, and one notch 101 is formed on the outer peripheral surface.

Similarly to the first clutch means 77, when the rotation of the rotary cylinder 99 in the counterclockwise direction in FIG. When the rotation of the drive shaft cylinder 96 is not transmitted to the driven shaft cylinder 97 and the rotating cylinder body 99 is released from the restrained state, the rotation of the drive shaft cylinder 96 is transmitted to the driven shaft cylinder 97 via the clutch spring 98. It's summery. Further, a plurality of gears 102 to 109 constituting a second driving connection means are supported on the first and second rotating shafts 8 and 9, and the final gear 109 is connected to the first rotating shaft 8 by a pin 110. Fixed. Then, the rotation of the driven shaft cylinder 97 is transmitted to the selection cam 39 via the gears 102 to 109, the first rotation shaft 8 and the control cam 41, and the selection cam 39, together with the positioning cam 53, is rotated counterclockwise in FIG. It is designed to be rotated at a reduced speed in the direction. Incidentally, in this embodiment, when the rotary cylinder 99 etc. of the second clutch means 95 is rotated once, the selection cam 39 and the positioning cam 53 are rotated by the rotation angle R (22.5 degrees) shown in FIG. It's getting old.

As shown in FIGS. 2, 5 and 10, a selection control arm 111 is provided on the support bracket 7, corresponding to the rotary cylinder 99 of the second clutch means 95.
The dissociation control arm 9 is rotatably supported around the dissociation control arm 9.
Due to the action of the leaf spring 112 attached on the
It is urged to rotate counterclockwise in the figure. Further, at the tip of the selection control arm 111, an engaging portion 113 that can be engaged with and disengaged from the notch 101 of the rotary cylinder 99 is provided. As shown in FIG. 5, the engaging portion 113 of the selection control arm 111 is always connected to the
When the selection control arm 111 is rotated clockwise from the state shown in FIG. 5, it is engaged as shown in FIG. 10. The portion 113 is disengaged from the notch 101, and the rotary cylinder body 99 is released from the restrained state.

Note that, as shown in FIGS. 2 and 3, a switching cam 114 is provided at the tip of the second rotating shaft 9, and the switching cam 114
When the operation lever 20 for setting the needle stop position shown in the figure is set to the needle down position, the selection button 5
When the second rotary shaft 9 is rotated through the coupling action of the first clutch means 77 based on the pressing operation of step 8, the cam action of the switching cam 114 moves the operating lever 20 from the set state of the needle down position. The setting state is changed to the needle up position. Since this mechanism does not seem to be directly related to this invention, its detailed explanation will be omitted, but if necessary, please refer to the aforementioned Japanese Patent Application No. 53-98404 (Japanese Patent Application Laid-open No. 55-24069).
Please refer to

As shown in FIGS. 5 and 10, a notch 86 is formed on the outer circumferential surface of the rotary cylinder body 84 of the first clutch means 77.
A selection regulating cam 115 is formed adjacent to the disengagement control arm 90 and can engage with the other engaging portion 93 of the dissociation control arm 90 . Then, the selection button 58
5, the release control arm 90 is rotated clockwise from the state shown in FIG.
When the disengagement cam 32 is rotated through the connection action of the cam 7 and the cam followers 30 and 31 are disengaged from the pattern cam 24 and the feed cam 25, the engagement portion 93 is opened as shown in FIG. 86 and when the disengagement cam 32 is stopped by the releasing action of the first clutch means 77, its engagement portion 93 engages with the selection regulating cam 115, and the disengagement control arm 90 moves as shown in FIG. It is further rotated in the timekeeping direction to the second rotational position shown in FIG.

As shown in FIGS. 5 and 10, the dissociation control arm 90
A linking pin 116 constituting follow-up linking means is projectingly provided on one arm of the arm, and is adapted to engage with the selection control arm 111. When the dissociation control arm 90 is rotated to the second rotation position as shown in FIG.
1, the selection control arm 111 is rotated clockwise from the state shown in FIG. , 31 are separated from the pattern cam 24 and the feed cam 25 and are moved along the axis of rotation of the cams.

As shown in FIGS. 3, 5 and 10, the second rotating shaft 9 is adjacent to the driven shaft cylinder 81 of the first clutch means 77 and is rotated integrally with the driven shaft cylinder 81. A cylindrical collar 117 is supported.
Further, a contact portion 119 is provided in a protruding manner on one arm portion of the selection control arm 111, and is normally engaged with the outer circumferential surface of the cylindrical collar 117 by the action of a leaf spring 112. Therefore, in FIG. 5, where the connection spring 94 is at its natural length, the release control arm 9
0 is held in that position by coming into contact with the engaging portion 113 of the selection control arm 111 from above under the action of the spring 91. Further, in FIG. 2, the selection button 58 is held at its protruding position by the action of a tension spring 133 stretched on the cam lever 63.

As shown in FIG. 3, the support bracket 7 has a rotary switch 1 constituting a stitch pattern display means.
20 is attached, and its operating shaft 121 is inserted and fixed to the end of the first rotating shaft 8, so that the switching operation is performed in conjunction with the rotation of the selection cam 39. Further, as shown in FIG. 1, a plurality of light emitting diodes 122 are arranged on the pattern display board 55 in correspondence with the shapes 56 of each stitch pattern, and the rotary switch 120 is activated as the selection cam 39B rotates. By the switching operation, the lighting state of the light emitting diodes 122 is sequentially changed and moved to the right, so that the pattern cam follower 30 displays the stitch pattern corresponding to the opposing pattern cam 24.

As shown in FIGS. 2, 5, 6, 7, and 10, in correspondence with the leaf spring 112 on the release control arm 90, the support bracket 7 has a rotating arm 12 constituting a blocking means.
3 is rotatably mounted by a pin 124 and biased to rotate clockwise in FIG. 7 by the action of a spring 125. Further, an engaging portion 126 is formed at the tip of the rotating arm 123 and is capable of engaging and detaching from the switching lever 16 that is rotated by the switching operation of the operating body 15. A blocking portion 127 that can be engaged with and detached from the proximal end portion of 112 is formed.

When the operating body 15 is switched to the sewing machine stop position shown by the solid line in FIG. 1 and the sewing machine is in a stopped state, it is engaged with the switching lever 16 as shown by the solid line in FIGS. 5 and 7. Due to the engagement with the portion 126, the pivoting arm 123 is rotated downward against the action of the spring 125, and the blocking portion 127 is rotated downwardly against the action of the spring 125.
The dissociation control arm 90 is arranged outside the rotation locus including the dissociation control arm 90 including the dissociation control arm 90 . Therefore, when the sewing machine is in a stopped state, rotation of the release control arm 90 based on the pressing operation of the selection button 58 is permitted.
Further, when the operating body 15 is switched to the sewing machine operation position shown by the chain line in FIG. 126 , the pivoting arm 123 is pivoted upward by the action of the spring 125 so that its blocking portion 127 is disposed within the pivoting trajectory of the dissociation control arm 90 . Therefore, during operation of the sewing machine, rotation of the release control arm 90 based on the pressing operation of the selection button 58 is prevented, and the first and second clutch means 77, 95 are prevented from rotating.
is not transferred to the connected state.

In addition, in FIG. 1, 128 is an upper cover;
29 is a side cover, 130 is a decorative plate, 131 is a manual operation knob for amplitude adjustment, and 132 is a manual operation knob for feed adjustment.

The operation of the zigzag sewing machine constructed as described above will now be described.

Now, when the operating body 15 is switched to the solid line position in FIG. 1 and the sewing machine is in a stopped state, the switching lever 16 is rotated to the solid line position in FIGS. 4, 5, and 7, and the transmission control is The clockwise rotation of the control body 66 in the planetary gear mechanism 64 is restrained by the lever 72 , and the rotating arm 123 is located outside the rotational trajectory of the dissociation control arm 90 . Rotation is allowed.

In this state, if the selection button 58 is pressed in order to change the currently selected stitch pattern to another stitch pattern (at the point in time in FIG.
t ⁰ ), the operating lever 59 is rotated counterclockwise from the state shown in FIG.
Then, the switch 60 is operated via the cam lever 63, and the sewing machine motor 5 is rotated at a low speed. As a result, the intermediate pulleys 11 and 12 are rotated together with the bush 10 in the counterclockwise direction in FIGS. 2 and 4 via the drive pulley 6 and belt 13, and the carrier 69 is rotated in the same direction by the action of the planetary gear mechanism 64. , the drive shaft cylinder 78 in the first clutch means 77 is rotated clockwise in FIG.
The drive shaft cylinder 96 in the second clutch means 95 is rotated counterclockwise in the figure. Further, as the intermediate pulley 12 rotates, the driven pulley 4 is rotated via the belt 14, and when the sewing machine is stopped, the clutch mechanism 3 is moved to the stopper 1 for stopping at a fixed position.
Since the main shaft 2 is in a dissociated state due to the action of 9 and the like, the main shaft 2 is not rotated.

On the other hand, due to the rotation of the operating lever 59 based on the pressing operation of the selection button 58, the disengagement control arm 90 is rotated clockwise from the state shown in FIG. is brought into a connecting state, and the disengagement cam 32 is rotated counterclockwise from its original position A in FIG. 8 via its first clutch means 77, second rotating shaft 9, and gears 87, 88. As the separation cam 32 rotates, the cam action between the cam areas B and C causes the sixth,
The contact pin 37 shown in Figures 8 and 9 is the positioning cam 53.
At the same time, the release lever 33 and the release plate 38 are released from the trough 53a of the cam followers 30, 3.
1 is released from the pattern cam 24 and feed cam 25 that are currently engaged. Then, the release cam 32
When the clutch is rotated 138 degrees to the D position in FIGS. 8 and 11 (time t1 in FIG. 11), the notch 86 of the first clutch means 77 and the other one on the release control arm 90 are connected as shown in FIG. Due to the engagement with the engaging portion 93, the first clutch means 77 enters the disengaged state and the disengagement cam 32 is stopped, and thereafter the cam follower 30, 31 is a pattern cam 24 and a feed cam 25
maintained in a dissociated state.

Also, at this time, as shown in FIG. 10, the engaging portion 93 engages with the selection restriction cam 115, and the dissociation control arm 90 is further rotated to the second rotation position, so that the linking pin 116 11, the selection control arm 111 is rotated clockwise, and the second clutch means 95 is brought into engagement after time t1 in FIG. Thereby, the second clutch means 9
5. The selection cam 93 begins to rotate counterclockwise in FIG. 9 together with the positioning cam 53 via the first rotating shaft 8, the gears 102 to 109, and the control cam 41, and as shown in FIGS. Every time the rotary cylinder 99 of the second clutch means 95 is rotated once, the selection cam 39 is rotated by a rotation angle R (22.5 degrees). Therefore, the cam followers 30 and 31 are separated from the pattern cam 24 and the feed cam 25 and are sequentially moved via the release levers 46 and 47 shown in FIG.

When the cam followers 30 and 31 are moved, the rotary switch 120 is switched in conjunction with the selection cam 39 by the rotation of the first rotating shaft 8, and the light emitting diode 122 shown in FIG. 1 is turned on. The status is sequentially changed and moved to the right.

In this way, the display state of the stitch pattern is sequentially changed and moved, and when the desired stitch pattern figure 56 is designated, when the pressing operation of the selection button 58 is released (time T0 in FIG. 12), the switch 60
is operated to return, and thereafter, the rotation of the sewing machine motor 5 is continued within a predetermined period of time. On the other hand, as the selection button 58 is released, the dissociation control arm 90 is
Since it is rotated counterclockwise from the state shown in the figure,
As shown in FIG.
Rotation begins from position D shown in Figure 12. Further, as the dissociation control arm 90 is rotated back, the selection control arm 111 is rotated back counterclockwise from the state shown in FIG. Placed within the moving trajectory.

Thereafter, the notch 101 is rotated until the rotary cylinder 99 of the second clutch means 95 is rotated by a maximum of 360 degrees (180 degrees in terms of the rotation angle of the rotary cylinder 84 of the first clutch means 77). When engaged with the engaging portion 113, the second clutch means 95 enters a disengaged state, as illustrated by solid lines, broken lines, and chain lines in FIG. Therefore, in FIG. 12, P1,
As shown at P2 and P3, when the second clutch means 95 is in the disengaged state at any of the times illustrated by the solid line, broken line, and chain line, the contact pin 49 on the contact lever 46 moves toward the circle of the pattern selection cam 44. With the contact pin 37 on the release lever 33 facing the center part of the arcuate cam part 44a and the valley part 53a of the positioning cam 53, the selection cam 39
Then, the rotation of the positioning cam 53 is stopped, and the cam followers 30 and 31 are stopped at positions opposite to the pattern cam 24 and the feed cam 25 corresponding to the desired stitch pattern.

On the other hand, after the disengagement cam 32 is rotated to position E in FIGS. 8 and 12 through the coupling action of the first clutch means 77, the contact pin 37 is moved relative to each other by the cam action between the cam areas E and F. is engaged with the valley portion 53a of the positioning cam 53, and
The cam followers 30 and 31 are engaged with the opposing pattern cam 24 and feed cam 25 via the release lever 33 and the release plate 38. At this time, the selection cam 3
9 and the positioning cam 53 are not accurately stopped at a predetermined position, the contact pin 37 comes into contact with one of the sloped surfaces on both sides of the trough 53a of the positioning cam 53 and is engaged with the trough 53a. Therefore, the stop position of the selection cam 39 is corrected,
The cam followers 30, 31 are accurately engaged with the pattern cam 24 and feed cam 25 corresponding to the desired stitch pattern.

When the disengagement cam 32 is rotated to the original position A shown in FIGS. 8 and 12, the notch 86 of the first clutch means 77 engages one of the disengagement control arms 90 as shown in FIG. The first clutch means 77 is brought into the disengaged state by engaging with the section 92, and the disengagement cam 3
2 is stopped, and thereafter the sewing machine motor 5 is stopped, and the stitch pattern selection operation is completed.

In this state, when the operating body 15 is switched from the solid line position shown in FIG. 1 to the chain line position, the clutch mechanism 3 shown in FIG. and the sewing machine is operated. During operation of this sewing machine, the pattern cam 24 and the feed cam 25 are rotated in conjunction with the rotation of the main shaft 2, and the pattern cam 24 is rotated in conjunction with the rotation of the main shaft 2.
The needle 21 is caused by the pattern cam follower 30 engaged with the needle 21.
A lateral rocking motion is applied to the feed cam follower 31 which is engaged with a predetermined feed cam 25.
The feeding movement of the feeding dog (not shown) is controlled by the sewing machine to form a desired stitch pattern on the work cloth.

Also, when operating this sewing machine, the 5th and 7th
As shown by the chain line in the figure, the switching lever 16 is rotated to the upper position and the rotating arm 123 is placed within the rotational trajectory of the dissociation control arm 90, so the selection button 58 may be pressed by mistake. Even if the connection spring 94
The disengagement control arm 90 is not rotated clockwise from the state shown in FIG. 5, and the first and second clutch means 77, 95 are maintained in the disengaged state. Therefore, while the sewing machine is operating,
The formation of unnecessary stitch patterns due to operational errors can be reliably prevented, and the needle 21 can be swung in the horizontal direction based on the pattern selection operation while the needle 21 is penetrating the work cloth. Therefore, it is possible to reliably prevent warping that would damage the processed cloth.

Note that the present invention is not limited to the embodiment described above, and for example, instead of the clutch mechanism 3 in the embodiment described above, a clutch mechanism may be provided between the main shaft 2 of the sewing machine and the needle bar, and the selection button 58 may be pressed. disengaging the clutch mechanism in connection with the operation;
It is also possible to arbitrarily change the configuration of each part without departing from the spirit of the invention, such as configuring the needle bar to stop moving up and down even when the main shaft 2 rotates.

Effects As detailed above, the present invention is configured so that the pattern cam can be selected using only the rotational force of the sewing machine motor without using an electromagnetic actuating member such as an electromagnetic solenoid. This has an excellent effect in that it can be easily and smoothly manufactured and the stitch pattern selection operation can be performed easily and smoothly.

[Brief explanation of the drawing]

FIG. 1 is a front view of a zigzag sewing machine embodying the present invention, FIG. 2 is an enlarged side view of the sewing machine with the side cover removed, and FIG. 3 is an enlarged sectional view taken along line 3-3 in FIG. 4 is a sectional view taken along line 4-4 in FIG. 3, FIG. 5 is a sectional view taken along line 5-5 in FIG. 3, and FIG. 6 is a reduced sectional view taken along line 6-6 in FIG. Fig. 7 is a partial rear view showing the related structure of the switching lever and rotating arm in Fig. 5, Fig. 8 is a side view with the dissociation cam removed, and Fig. 9 is a side view with the selection cam and positioning cam removed. Figure, 1st
Fig. 0 is a sectional view showing the operating state of Fig. 5, Fig. 11 is a time chart showing the operating state of the clutch means and each cam based on the pressing operation of the selection button;
Similarly, FIG. 2 is a time chart showing the operating state of the clutch means and each cam based on the release of the selection button. Sewing machine frame...1, Main shaft...2, Clutch mechanism...3, Sewing machine motor...5, Support bracket...
...7. First rotation axis... 8. Second rotation axis...
9, Operation body...15, Switching lever...16, Needle...21, Pattern cam...24, Pattern cam follower...
...30, Release cam...32, Release lever...3
3. Contact pin...37, Selection cam...39, Pattern selection cam...44, Contact lever...46, Contact pin...49, Positioning cam...53, Pattern display board...55, Stitch pattern Shape...56, Selection button...58, Electrical switch...60, Planetary gear mechanism...64, Transmission control lever...72, First clutch means...77, Rotating barrel...84, Gear...
...87, 88 (the first drive coupling means is constituted by the aforementioned 9, 77, 87, 88, etc.), disengagement control arm...90, engaging portion...92, 93, second clutch means... ...95, Rotating cylinder body...99, Gears...102 to 109 (the above 8, 95, 102 to 1
09 etc.), selection control arm...111, engaging portion...11
3. Selection regulation cam...115, Linking pin as follow-up connection means...116, Rotary switch...
120, light emitting diode...122 (said 56,
120, 122, etc. constitute a stitch pattern display means).

Claims (1)

[Scope of Claims] 1. A main shaft 2 of a sewing machine rotatably supported by a sewing machine frame 1, a sewing machine motor 5 for rotationally driving the main shaft 2, and a plurality of patterns that rotate in conjunction with the main shaft 2. A zigzag sewing machine comprising a cam 24 and a cam follower 30 that engages with any cam of the pattern cams 24 and gives the needle 21 a lateral rocking motion according to the shape of the cam, the cam follower 30 A disengagement cam 3 rotatable to control engagement and disengagement with the pattern cam 24 of the
2, and the cam follower 30 released from the pattern cam 24 by the action of the separation cam 32 is removed from the pattern cam 24.
a selection cam 39 rotatable for movement along the axis of rotation of the stitch pattern; a single selection button 58 operable to press to select a desired stitch pattern; an electric switch 60 for supplying electric power to the sewing machine motor 5; and a first clutch means 77 for drivingly connecting the sewing machine motor 5 and the dissociation cam 32 so as to be able to connect and separate them; connection means (9, 87, 88, etc.), which are operatively connected to the selection button 58 and temporarily transmit the rotation of the sewing machine motor 5 to the separation cam 32 in connection with the pressing operation of the selection button 58; separating the cam follower 30 from the pattern cam 24;
The dissociation cam 32 is arranged so that the dissociation state continues until the selection button 58 is subsequently released.
In order to stop the first clutch means 7
a second drive coupling means (8, 102-109 etc.)
and a selection control arm 1 that can be engaged with and disengaged from the second clutch means 95 in order to transmit or cut off the rotation of the sewing machine motor 5 to the selection cam 39.
11 and the dissociation control arm 90 which rotates in synchronization with the rotation of the dissociation cam 32 and is moved by pressing the selection button 58 engages, and the cam follower 30 is disengaged from the pattern cam 24. a selection regulating cam 115 that causes a second movement of the separation control arm 90 when the separation cam 32 is stopped; and a selection control cam 115 that moves the selection control arm 111 in relation to the second movement of the separation control arm 90; The disengagement control arm 90 and the selection control arm 11 are arranged to rotate the selection cam 39 through the coupling action of the second clutch means 95.
Follow-up connection means (116 etc.) arranged between 1 and 1.
The stitch pattern is operated so that the display state is sequentially changed and moved in one direction in synchronization with the rotation of the selection cam 39, and the cam follower 30 displays the stitch pattern corresponding to the opposing pattern cam 24. Display means (56, 12
0, 122, etc.), and by pressing the selection button 58, the cam follower 3
0 is sequentially moved in a state of being dissociated from the pattern cam 24, and the cam follower 30 engages with the desired pattern cam 24 by releasing the pressing operation of the selection button 58. 2. The cam selection device for a zigzag sewing machine according to claim 1, wherein the follow-up connection means includes a link pin 116 fixed to the dissociation control arm 90 and capable of engaging the selection control arm 111 by movement of the link pin 116. 3. The stitch pattern display means is a rotary switch 12 that switches in conjunction with the rotation of the selection cam 39.
A cam selection device in a zigzag sewing machine according to claim 1, wherein the cam selection device includes 0.