JPS6067B2 - Zigzag sewing machine automatic feed setting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic feed setting device for a zigzag sewing machine. The operating body is always moved to a predetermined position, and the feed amount and feed direction that are judged to be optimal for forming the selected stitch pattern are automatically set according to each stitch pattern, and the feed amount and feed direction that are determined to be optimal for forming the selected stitch pattern are automatically set. Accordingly, by moving the manual operation member body from the predetermined position in one direction or another direction, the feed amount is manually controlled so as to gradually decrease or increase with respect to the automatically set feed amount. This feature is characterized in that it can be changed as appropriate.

In a conventional zigzag sewing machine, a desired stitch pattern is selected by operating the cam selection means, and a desired zigzag amplitude and feed amount suitable for forming the stitch pattern are set by manual operation. However, "Depending on the selected stitch pattern, the setting range of the zigzag amplitude or feed amount may be limited when forming the stitch pattern, and it is difficult to form a stitch pattern with a good appearance. It is not always possible to arbitrarily set the zigzag amplitude and feed rate. This can be done relatively easily by simply holding the zigzag amplitude at the maximum position, except in the case of stitches.However, regarding the feed amount, relatively detailed setting operations are required depending on the stitch pattern. In addition to being difficult for workers to grasp intuitively, ``If a person who does not use a sewing machine on a regular basis attempts to use the sewing machine from time to time, the feed amount may be in a state that is not suitable for forming the selected stitch pattern.'' If the sewing machine is operated under such conditions, the desired stitch pattern will not be formed and the stitch pattern will look disordered, causing the operator to feel as if the sewing machine is This creates the illusion that the sewing machine is malfunctioning, or gives the impression that the sewing machine is difficult to use.In view of these circumstances, the applicant has decided to manually set the zigzag amplitude and feed amount. An automatic zigzag sewing machine that can eliminate the need for operations was proposed in Japanese Patent Application No. 50-26777.

This zigzag sewing machine proposed by the applicant is equipped with a control cam that rotates in conjunction with the pattern selection operation. The adjuster is configured to automatically set itself to a state suitable for forming the stitch pattern, and when manual operation knobs respectively connected to both adjusters are operated, the adjusters are set to the control cam. The zigzag sewing machine is configured so that the settings can be changed from the automatically set state to another state by the action of It has the advantage that it can be set automatically, thereby immediately forming a seam pattern with a predetermined basic shape, and further, that the shape of the seam pattern can be changed and formed as necessary. There is.

However, in the configuration of such a zigzag sewing machine, the above-mentioned control cam, interlocking means for interlocking the control cam with the pattern selection mechanism, and a complicated structure for irreversibly connecting the control cam to each adjuster are required. This requires additional connecting means and the like, which increases the number of parts and increases manufacturing costs.

Therefore, the present applicant further proposed in Japanese Patent Application No. 125136/1980 a zigzag sewing machine that has a simplified configuration and can omit the manual setting of the zigzag amplitude or feed amount. Manual knobs connected to the machine and the feed adjuster, respectively, are at a fixed operating position in which a predetermined zigzag amplitude and feed amount are set through the formation of all selectable stitch patterns in conjunction with the pattern selection operation. When the manual knobs connected to both regulators are operated, the regulators are automatically moved from the set state to any other state. Therefore, it is very effective for beginners in that it is possible to omit setting operations for both adjusters before starting sewing with the sewing machine, but each adjuster can be selected. Since the settings are not always optimal for each stitch pattern, experienced workers may have to manually reset both adjusters. There is.

Although the present invention has been made in view of the above-mentioned circumstances, its purpose is to operate the feed adjuster by simply selecting a desired stitch pattern when using a sewing machine. Even though the manual operation body is moved and held at a fixed operation position, the feed amount determined to be optimal for each selected stitch pattern is automatically set, and the manual operation body is moved and held at a fixed operation position. A practical zigzag machine that can be operated so that the feed adjuster increases or decreases the automatically set feed amount for each twill pattern within an adjustment range suitable for forming that stitch pattern. An object of the present invention is to provide an automatic feed setting device for a sewing machine. To accomplish this objective, the present invention provides a plurality of feeds that are selectively engageable by a cam follower operatively connected to a feed adjuster. Even if a control cam is provided, the feed control cam is configured so that it can be rotated from outside the sewing machine frame by operating a manual operation member, regardless of the rotation of the main shaft of the sewing machine, and the manual operation member is normally operated by a spring. Retaining means are provided for operatively holding the cam follower in place to engage the feed control cam surface at a predetermined angular position of the feed control cam; A locking means for locking the manual operation member in the moving position when the manual operation member is moved, and a connection for releasing the action of the locking means in connection with the operation of the cam selection means. A means is provided, and a cam portion is formed at a predetermined angular position of the plurality of feed control cams for setting a feed amount and feed direction that are determined to be optimal for forming each of the stitch patterns. A feed adjustment cam surface that gradually decreases the feed amount in one direction and a feed adjustment cam surface that gradually increases the feed amount in the other direction are formed continuously on the cam portion.

Therefore, when the cam selection means is operated to select a new stitch pattern, the optimum feed amount and feed direction are set by the action of the cam portion of the predetermined feed control cam according to the selected stitch pattern. In addition, when the feed control cam is rotated by operating the manual operation member, the feed amount can be arbitrarily set by the action of the feed adjustment cam surface.

Moreover, the range of the feed amount that can be set can be adjusted by forming the feed adjustment cam surface according to the stitch pattern that requires fine adjustment of the feed amount or the stitch pattern that requires adjustment of the feed amount over a wide range. It can be set arbitrarily. An embodiment embodying the present invention will be described below with reference to the drawings.

Figure Nakagawa shows the main shaft of the sewing machine supported on the machine frame 2.
One end of the camshaft is fixed to the machine frame 2, and the other end is fixed to the auxiliary machine frame 4, which is fixed to the sewing machine frame 2.

Reference numeral 5 denotes a plurality of patterned cams 8 for imparting a lateral swinging motion to the needle 7 fixed to the lower end of the needle twill 6. The cam 8 is an automatic feed control cam for periodically changing the feed motion of the feed dog. The cams 5 and 8 are integrally inserted and supported on the camshaft 3 together with a gear 9, and due to the meshing of the gear 9 with a gear 10 fixed to the main shaft 1, the cams 5 and 8 move with the main shaft 1 of the sewing machine to reduce rotation speed. Driven.

Feed control cams 11 to 15 are supported by the camshaft 3 and have different feed adjustment cam surfaces, and are integrally formed of a synthetic resin material. It is possible to move.

Further, 16 is a fixed shaft supported by the sewing machine frame 2 and the auxiliary machine frame 4 in parallel with the camshaft 3, and 17 and 18 are each swingably attached to the fixed shaft i6 in a U-shape in plan view. The first and second rocking frames are shaped like a shaft and are mounted so as not to move in all directions. 19 and 20 are the fixed shafts 1 positioned within the first and second swing frames 17 and 18, respectively.
The first and second cam followers whose proximal ends are inserted into 6,
As is clear from FIG. 7, connection shafts 21, which are respectively fixed to the swing frame turtles 7 and 18 in parallel with the fixed shaft 16,
22, the pattern cams swing integrally with the swing frames 17 and 18, and are movable in the axial direction within the frames. and can selectively engage with any one of the feed control cams.

Further, the first swing frame 17 has one end connected to the fixed shaft i.
A connecting plate 23 inserted into the first swing frame 17 is fixed so as to be adjustable in position, and swings integrally with the first swing frame 17. Referring to FIGS. 2 to 4 and 8, 24 is an operating shaft supported by a sleeve 25 fixed to the auxiliary machine frame 4, and 26 is fixed to the operating shaft 24. A first manual knob 27 located on the front side of the sewing machine has a locking circle iron-fitted to the inner end of the manual knob 26 so that it can rotate integrally with the manual knob 26 and the operating shaft 24. As is clear from FIG. 5, the plate is provided with a recess 28 and locking teeth 29 on its outer periphery. 301 is a movable arm that is supported by the sleeve 25, and a needle position changing knob 31 that protrudes forward is fixed to one end of the movable arm.

Reference numeral 32 denotes a needle position changing arm which is supported by the sleeve 25 through the bag tube 33. Reference numeral 34 denotes a swinging link which is pivotally attached to the arm 32 by a pivot 35, and its tip is connected to the connecting plate by a connecting arm 36. 23, and swings around a pivot 35 in accordance with the swing of the first swing frame 17.

In addition, "3" is a rotating arm fixed to the inner end of the operating shaft 24, and 38 is a roller 39 that engages with the swing link 34 at one end.
The rotary arm 371 is connected to the link 401 by a needle support frame (not shown) that supports the handle, and the rotating arm 371 is connected to the link 401. By changing the position of the roller 39 with respect to the pivot point of the swing link 34, the amount of lateral swing momentum imparted to the needle 7 can be adjusted.
, the link 40, the spreading arm 37, etc. constitute an amplitude adjuster. By the action of a spring means (not shown) provided between the needle support frame and the sewing machine frame for biasing the support frame in one direction, the rollers 39 of the lever 38 are constantly oscillated. While engaging with the movable link 34, a rotational force in the counterclockwise direction in FIGS. 3 and 4 is applied to the first swing frame 17 via the connecting arm 36, whereby the first cam The follower head 9 is always in pressure contact with the pattern cam 5. Also,
Reference numeral 41 denotes a bow spring stretched between the rotating arm 37 and the sewing machine frame, which urges the roller 39, which is normally engaged with the swing link 34, in a direction away from its pivot point 35. At the same time, the operating shaft 24 to which the first manual knob 26 is fixed is given a rotational force in the clockwise direction in FIG. 4, and the operation shaft 2
4 is prevented from rotating.

Reference numeral 43 denotes a tension spring stretched between the needle position changing arm 32 and the auxiliary machine frame 4, which applies rotational force to the changing arm 32 in the clockwise direction in FIG. is held in a state where it is engaged with a support screw 44 that is adjustable and fixed to the auxiliary machine frame 4.

Further, reference numeral 45 denotes a spring stretched between the movable arm 30 and the auxiliary machine frame 4, which applies a rotational force to the movable arm 3 in the clockwise direction in FIG. 3. Reference numeral 46 denotes an engagement lever pivotally connected to the auxiliary machine frame 4 by a step screw 47, and a tension spring 48.
Due to this action, one side of the movable arm 301 is iron-locked to either one of the positioning recesses 49, 60 formed in the movable arm 301, thereby preventing the movable arm 30 from moving.

Therefore, from the state shown in FIG.
When the movable arm 301 is rotated against the action of the spring 43, the adjustable screw 51 engages with the needle position changing arm 32, causing the changing arm 32 to be moved by the action of the tension spring 43. The position of the swinging link 34 is changed by rotating the swinging link 34, thereby changing the position of the needle. And the moving arm 30
The other recess 501 engages the engagement lever 46 to hold the needle position changing arm 32 in its moving position. Furthermore, “52
5 is a locking bar pivotally attached to the auxiliary machine frame 4 by a stepped screw 53, and as is clear from FIG. A matching locking pin 55 is fixed. Therefore, when the operating shaft 24 is rotated by the first manual knob 26 against the action of the tension spring 41, the position of the roller 39 of the needle datsukaji 38 is changed, and the needle 7 is swung in the lateral direction. The dynamic momentum is adjusted, and at this time, the operating shaft 24 is held in the operating position by the cooperation between the locking bar 52 and the locking disk 27. Next, regarding the operational connection between the second swing frame 18 and the feeding mechanism, the sixth
, 8 and 9.

56 is a triangular cam fixed to the main shaft 1, 57 is a forked rod whose upper end embraces the triangular cam 56 and whose lower end is connected to a horizontally feeding (not shown) rod; 58 is the forked rod 5;
This is a known feed adjuster that guides the movement of the square piece pivotally mounted on the sewing machine frame 2. It is supported by the sewing machine frame 2 by a pivot shaft 59, and the rotation force in the counterclockwise direction in FIG. Granted.

61 is a lotus camphor whose one end is connected to the feed adjuster 58;
Reference numeral 2 denotes a connecting arm connected to the lotus tree 61 and the second swing frame 18, and an adjustable engagement screw 63 that engages with one side of the swing frame 18 is fixed thereto.

Therefore, the swinging frame 18 is given a clockwise rotational force in FIG. 9 by the action of the tension spring 60, and the second cam follower 20 is pressed against the feed control cam. Further, referring to FIGS. 2, 8, and 9, reference numeral 64 indicates a second operating shaft rotatably supported on the sewing machine frame 2 and the auxiliary machine frame 4, and 65 indicates a second operating shaft fixed to the operating shaft 64 of the sewing machine. The second manual knob 66 located on the front side is a locking disc that is iron-coupled to the inner end of the knob 65 so that it can rotate integrally with the manual knob 66 and the operating shaft 64, As is clear from FIG. 5, a recess 67 and locking teeth 68 are provided on the outer periphery.

69 is a reverse feed control cam (
(See Fig. 3) 70G is a rotary arm fixed to the operating shaft 64 with iron, 71 is an operating arm rotatably supported on the operating shaft 64, and 72 is connected to the above by a protruding pin 73 at one end. The rotary arm 701 is connected to a lotus birch, and the other end is connected to a connecting plate 74 fixed to the feed control cams 11 to 15.

Reference numeral 75 denotes a tension spring stretched between the operating arm 71 and the sewing machine frame 2, which applies rotational force to the operating arm 71 in the counterclockwise direction in FIG. An adjustably fixed abutment screw 76 acts to hold a flat surface 771 formed on the sewing machine frame 2 in an abutting state.

Reference numeral 78 denotes a tension spring stretched between the operating arm 71 and the rotating arm 70, which acts so that the protruding pin 73 is always held in a state engaged with one side of the operating arm 71. are doing.

A second locking bar 79 is pivotally attached to the auxiliary machine frame 4 through a stepped screw 801, and as is clear from FIGS. 3 and 5, the locking bar 79 The fixed locking pin 81 is moved to the locking disk 66 by the action of the tension spring 82.
The locking teeth 68 are engaged.

Therefore, when the operating shaft 64 is rotated by the second manual knob 65 against the action of the tension spring 78, the feed control cams 11 to 15 each having a feed adjustment cam surface, which will be described later, move as shown in FIG. When the second cam follower 20 is rotated in the anti-Japanese direction and the second cam follower 20 is engaged with one of the feed control cams, the swing frame 18 is connected to the feed adjuster via the connecting arm 62 and the lotus birch 61. 58 is rotated to increase the amount of cloth feed. Conversely, when the operating shaft 64 is rotated clockwise in FIG. 9 against the action of the tension spring 75, the amount of cloth feed is increased. In either case, the locking bar 79 and the locking disc 66
The operation shaft 64 is held at any rotational position by cooperation with the above-mentioned operation shaft 64. Note that the auxiliary machine frame 4 has a regulating pin 83.
(see FIG. 5) is fixed, located within a recess 67 of the locking disc 66, and abuts against both side edges of the recess 67 to restrict the rotation range of the operating shaft 64. Therefore, the adjustment cam surfaces ila to 5a of the feed control cam turtle wings to 15 will be explained with reference to FIGS. 9 to 12.As shown by solid lines in FIG. When the screw 76 is in contact with the flat surface 77 of the sewing machine frame 2 and the protruding pin 73 connecting the rotary arm 70 and the lotus birch 2 is in contact with one side of the operating arm 71, Second manual knob 6
5 is a joint plate 85 whose pointer 84 is fixed to the sewing machine frame 2.
This corresponds to the symbol A of the display 86, which is marked with a square mark. In such a state, the second cam follower 2
The same angular position Pa of the feed control cams 11 to 15
Cam portions 11b to 15b that can be relatively engaged with the feed adjustment cam surfaces 11a to 15a of each cam at the same angular position Pa are formed at different distances from the axis of the camshaft 3, respectively. Furthermore, as stated above, the second manual knob 65 can be selectively rotated in both directions from the position shown in FIG. The cam follower 201 corresponds to the feed control cam 1 within its operating range.
It can selectively engage each of the feed adjustment cam surfaces 11a to 5a within an angular range Q from 1 to 15 angular positions Ps to PI. One of the feed adjustment cam surfaces 14a is formed into a cam surface with an equal radius centered on the yaw line of the camshaft 3 for the purpose of interlocking the buttonholes, which will be described later. When the cam follower 20 engages with the feed adjustment cam 14a, the feed adjuster 58 is operated to set the feed amount to zero. Also, among the other feed adjustment cam surfaces 12a and 13a
and 15a each include a cam portion at each angle position Pa, and the feed adjustment cam surface 1 at the angular position Ps.
4a, different cam surfaces are formed that gradually increase the distance from the feed adjustment cam surface 14a from the position Ps to the position PI, and the remaining feed adjustment cam surface 11a is formed from the feed adjustment cam surface 12a. Therefore, by rotating the manual knob 65 clockwise or counterclockwise from the position shown in FIG. (excluding 1) generally increases or decreases gradually, and the display 86 is marked so that the scale interval gradually increases from the symbol S to the symbol L. Next, the third, fourth, The feed reversal mechanism will be explained with reference to Fig. 6. Reference numeral 87 indicates a rotating shaft rotatably supported on the sewing machine frame, 88 indicates a reversing operation lever fixed to one end of the rotating shaft 87, and 89 indicates the aforementioned A forked lotus camphor fixed to the other end of the rotating shaft 87, 90 is an operating arm inserted into the pivot 62, and a connecting pin 91 fixed to a part thereof is connected to the two prongs of the forked lotus camphor 89 I have a strong relationship with the department.

92 is a movable plate whose lower end is connected to the operating arm 991;
It is iron-coupled to the operating shaft 64 at the upper end so as to be able to move up and down, and an engagement pin 93 facing the reverse feed control cam 69 from below is provided at the middle part.

94 is a coiled spring wound around the rotation shaft 87;
The bifurcated lotus 89 is given a rotational force in the clockwise direction as shown in FIG. has been done.

Therefore, when the reverse operation lever 88 is rotated against the action of the coil spring 94, the operation arm 90 is rotated until the engagement pin 93 of the movable plate 92 comes into contact with the reverse feed control cam 69.
The operating arm 98' is adjustable with a support screw 96 fixed thereto.
engages with the green side of the feed adjuster 58 and rotates the adjuster 5 in the opposite direction to produce a reverse feed amount that is approximately the same as the normal feed amount set by the feed adjustment cam 13.Next. To,
The pattern selection means will be explained with reference to FIGS. 3, 4, 6, and 7. 97 is a third operating shaft rotatably supported on the sewing machine frame 2; 98 is a selection knob 99,1 fixed to one end of the operating shaft 97 and located on the front side of the sewing machine frame;
First and second actuating cam parts are fixedly attached to the operating shaft 97 so as to rotate integrally with each other, and the first actuating cam part 99 is connected to the "engaging lever 46". locking bar 5
2 and a release cam gate 01 for releasing the action of the second locking bar 79, and a first selection cam 102 for determining the axial movement position of the first cam follower 19. has been done.

Further, a second operating cam holder 00 includes a detachment cam 103 for detaching the first and second cam followers 20 from the pattern cam 5 and the feed control cam, and a detachment cam 103 for detaching the first and second cam followers 20 from the pattern cam 5 and the feed control cam, and A second selection cam 104 for determining the axial movement position of the child 20 is formed. Reference numeral 105 denotes a contact lever that is supported so as to be able to be rolled around on an event pin 106 fixed to the sewing machine frame.A contact head 107 is formed in the middle part of the contact lever, and the contact head IQ7 is formed by the action of a coil spring ID8.
The said breakaway cam army Q song is a crushing miss.

The ball Q9 is located between the first and second swing frame 7 and 8, and the fixed wheel release lever 6 is attached to a release lever supported by three drums, and its lower end is connected to the tip of the contact lever member Q5. A support screw bracket 18 facing one side edge of the first swinging frame 7 is adjustably fixed to the upper end thereof, and The end portion 1 and the turtle 2 (see FIGS. 2 and 9) facing the negative side edge of the second swing frame 18 are bent. Therefore, the detachment lever IQ9 is moved clockwise in FIG. When the twill screw 111 is rotated to
and the twill part 112 is the first and second swing frame 17, 181
The two swing frames are brought into contact with each other and rotated in the same direction, and the first and second cam follower fins are separated from the pattern cam and the feed control cam. In addition, wing weight 8, military dormitory 43
are the first and second moving levers which are rotatably attached to the sewing machine frame 2 by step screws 1 and 6, respectively, and the lower ends of both levers have hair scale pins 79, respectively.
118 is provided at the upper end thereof, and competing pin armatures 9, 120 are fixed in annular grooves formed at the base ends of the first and second cam followers 9, 28, respectively.

The force double is a helical spring for imparting a clockwise rotational force to the first movable lever blade amount 3 in the clockwise direction in FIG. Similarly, the "second moving lever" is biased by the action of a winding spring (not shown), and its contact pin 11
8 is in pressure contact with the second selection cam waterfall Q4. Therefore, when the selection knob 98 is rotated, the first and second actuating cam parts 99 and IQQ rotate together with the operating shaft 97, and first, the first and second oscillating cam parts 99, The movable frame turtles 7, 18 are rotated, and the first and second cam followers 19,
29 separates from the pattern cam and feed control cam that had been engaged up until then, but then the first and second selection cam groups Q2? 104, the first and second moving levers 113, 114 are rotated, and both the cam followers 1
9 and 20 move independently along the fixed shaft 161 to select any desired cam.The operation of this cam selection means has been well known for a long time, and further explanation will be omitted. As shown in FIG. 1, the stitch pattern corresponding to the selected cam is indicated by the cooperation between the pattern display marked on the front surface of the selection knob 98 and the index 122 carved on the sewing machine frame. It is something that will be done.

Also, the third? 5 and 7, 123 is a release arm rotatably supported by a shaft pin 124 fixed to the sewing machine frame 2, and the release cam 1 is rotated by the action of a coil spring 125.
0 River is in pressure contact.

Reference numeral 126 denotes a rod whose lower end is connected to the release arm turtle 23, and whose upper end bent portion 127 is joined to a vertical slot 128 bored in the auxiliary machine frame 4 and supported so as to be movable up and down.

Each end of the engagement lever 46 and the first and second locking bars 52, 79 is opposed to the upper bent portion 127 of the rod 126 from below, so that the rod 126 can be pulled down. When the levers 46, 52, 79 are rotated against the action of the tension springs 48, 54, 82, the movable arm 30 is engaged with the first and third locking discs 27, 66. Releases the inhibitory effect. In the figure, 129 is a side cover, 13 is a handwheel, and 13 is a top lid.

The present embodiment is configured as described above, and its operating mode will be explained below.

First, as shown in FIG. 1, the case where the zigzag stitch display of the selection knob 98 matches the indicator 122 and the zigzag stitch is performed will be described.

In this case, the first cam follower 19 engages with the zigzag basic cam 5a in the pattern cam 5 (see FIG. 4), and the second cam follower engages with the feed control cam 11 (the ninth
(see figure). The first manual knob 26 and the needle position changing knob 31 are positioned to set the maximum amplitude 5 and the central reference needle position M, respectively, and the second manual knob 65 is
As shown in FIG. 10, even if the pointer 84 matches the symbol A of the display 86, the intermediate feed amount 2 is set by the cam part ilb at the angular position Pa of the feed control cam 11. In this state, the sewing machine is operated. Then, as is clear from FIGS. 3 and 4, the first cam follower 19 engaged with the zigzag basic cam 5a rotating in conjunction with the main shaft 1 moves to the swing frame 17.
and the connecting plate 23, the swinging link 34 is rotated via the connecting arm 36, and the needle support frame swings via the needle support frame 38, causing the needle to swing laterally. The dynamic motion is maximum because the roller 39 of the needle camellia link 38 is located farthest from the pivot 35 of the swing link 34. Therefore, the maximum amplitude 5, the medium Zigzag stitching can be performed with a feed amount of 2. However, when the first manual knob 26 is rotated to reduce the horizontal swinging momentum of the needle 7, the rotating arm 37 is pulled together with the operating shaft 24. 41
4, and the roller 39 approaches the pivot 35 of the swing link 34 via the resist 40.

Then, due to the cooperation between the locking teeth 29 of the locking disc 27 and the locking pin 55 of the locking bar 52 shown in FIG. It is locked in any rotational position against the action of Therefore, needle 7
The amount of lateral rocking momentum imparted to can be arbitrarily adjusted between 0 and 5. Further, if it is desired to change the feed amount, it can be changed by rotating the second manual knob 65. That is, if the manual knob 65 is rotated clockwise in FIGS.
It is also rotated counterclockwise in FIG.
2, the feed control cam 11 is rotated in the same direction as the other feed control cams 12 to 15. As a result, the second cam follower 20 rotates together with the swing frame 18 according to the feed adjustment cam surface 11a, and the feed adjuster 58 gradually adjusts the feed amount from the intermediate feed 2 via the connecting arm 62 and the lotus birch 61. Rotated to increase. By the cooperation of the locking tooth 68 of the locking disc 66 shown in FIG. 5 and the locking pin 81 of the locking bar 79 based on the action of the tension spring 82 (see FIG. 3), the manual knob is The reference numeral 65 is locked in an arbitrary spreading position against the action of a tension spring 78. This is the position when the knob 65 is rotated to the maximum clockwise in FIG. 10 and the pointer 84 matches the symbol L on the display 86. In this position, the second cam follower 20
is the adjustment cam surface 11a of the feed control cam 11 and the angular position Pi
, and change the feed amount to a maximum of 4. Then,
If the manual knob 65 is rotated in the counterclockwise direction in FIGS.
4, in the clockwise direction in FIG. Thereby, the feed control cam 11 is controlled by the other cams 12 to 15.
The feed adjuster 58 is rotated via the cam follower 20 so as to gradually decrease the feed amount from the intermediate feed 2. The manual knob 65 is locked at any rotational position by the cooperation of the locking disc 66 and the locking bar 79 against the action of the tension spring 75, as described above. "The position indicated by the dotted line in FIG.
1 at the angular position Ps, and the feed amount is reduced to a minute feed F.
Change to In this way, the feed adjuster 58 is operated to set the feed amounts F to 4 by rotating the manual knob 65. Furthermore, if you want to change the needle position from the center reference position to the right reference position, move the needle position change knob 31 to the first position.
When the moving arm 30 is moved upward in the figure, the moving arm 30 is rotated counterclockwise in FIG. Rotate it.

As a result, the pivot 35 of the swing link 34 is moved to the right, and the needle position is changed to the right reference. Then, the engagement lever 46 is engaged with the other recess 501 of the movable arm 30 by the action of the pull spring 48, thereby locking the movable arm 30 in that position. After completing the required zigzag stitch, the selection knob 9 is turned to form another stitch pattern, for example, stitch pattern 2 shown in FIG.
8 is rotated, the action of the detachment cam 103 and the first selection cam 102 causes the first cam follower 19 to engage with the pattern cam corresponding to the stitch pattern D, and also to engage the second cam follower 19. The cam follower 206 also engages the other feed control cams 12 . On the other hand, at the initial stage of rotation of the operation shaft 97, the release cam I
Because the release arm 123 is rotated counterclockwise in FIG. 3 by the action of QI, the rod 126 is pulled downward.
The first and second locking bars 5 are connected by the upper end bent portion 127.
2, 79 and the engagement lever 46, respectively.
The locking discs 27, 66 rotate against the action of the locking discs 27, 66.
and release the movable arm 30. As a result, the first and second manual knobs 26 and 6 can be
Even if the needle position changing knob 5 and the needle position changing knob 31 are moved to an arbitrary position, they return to their original positions shown in FIG. The parts are shown in Figures 3 to 5 and 9.
The state returns to the state shown in the figure. In this state, the second cam follower 20' engages with the cam portion 12b of the feed control cam 12 at the angular position Pa, and the feed adjuster 58 is operated to set the feed amount to a small feed. When the sewing machine is operated, the central reference needle position reaches the maximum amplitude 5, and the small feed river trowel stitch pattern 2 is formed. If you want to change the amplitude or needle position, use the first manual knob 26 as described above.
Alternatively, this can be done as appropriate by moving the needle position changing knob 34, and the locking disk 27 and the locking bar 52 or the movable arm 30 and the engagement lever 46 are moved to the moved position.
It is locked by each locking means such as. In addition, if you want to change the feed amount, please operate the second manual knob 65.
It can be changed according to the feed adjustment cam surface 123 of 2.
In this case, the feed amount adjustable range is from 0 to large feed 3. Furthermore, if it is desired to form the stitch pattern ``H'' or ``H'' shown in FIG.

In this case as well, the first and second manual knobs 26, 65 and the needle position changing knob 31 are unlocked at the beginning of rotation of the selection knob 98, and each of these knobs is preliminarily controlled by the action of a tension spring. Return to the original position. The first cam follower 19 then engages a corresponding cam in the pattern cam 5, and the second cam follower 19 engages a further feed control cam 13. Manual knob 6
5 is located in the state shown in FIG. 10 where the pointer 84 and the symbol A of the display 86 match, as in the case described above, but the angle between the second cam follower 20 and the feed control cam 13 is By engaging with the cam portion 13b at position Pa, the feed adjuster 58 is operated to set the feed amount to a minute feed F'. When the sewing machine is operated in this state, a stitch pattern E or F is formed at a maximum amplitude of 5, a central reference needle position M, and a minute feed F. In this case, the feed amount adjustable range is
Based on the feed adjustment cam surface 13a, the feed is from 0 to 4/feed 1. By the way, if you want to perform straight stitching,
This can be done by selecting the stitch pattern opening shown in FIG. 3 and operating the first manual knob 26 to make the swinging amplitude of the needle 7 zero, but in this embodiment, it is also possible to do it as follows. It is possible.

That is, if the selection knob 98 is operated so that the display corresponding to straight stitch A matches the index 122, the first cam follower 19 engages with the round cam having the same radius in the pattern cam 5, A second cam follower 2 engages the feed control cam il. When the selection knob 98 is operated, the first and second manual knobs 26, 65 and the needle position change knob 31 return to their original positions as shown in FIG. is maintained. If the sewing machine is operated in this state, the swing link 34 will not swing at all due to the action of the round cam, so that straight stitches can be performed at the intermediate feed amount of 2. It is clear that there is no effect even if the first manual knob 26 is moved from its original position to another position.
It goes without saying that the feed amount can be arbitrarily changed from minute feed F to maximum feed 4 by operating the second manual knob 65. As described above, when forming stitch patterns A to A, the second manual knob 65 always moves back to the predetermined position by rotating the selection knob 98, and the second cam follower 20 selectively engages with the feed control cams 11 to 13 at the same angular position Pa, and the feed amount determined to be optimal for the selected stitch pattern is automatically determined by the cam portions 11b to 13b of each cam. "The feed amount is adjusted to the above value through the selective engagement of the second cam follower 20 and the feed adjustment cam surfaces 11a to 13a by the subsequent rotational operation of the second manual knob 65." The automatically set feed amount can be manually changed to gradually increase or decrease.

The feed adjustment range is the feed adjustment cam surface 1.
1a to 13a are predetermined. Therefore,
When forming the selected stitch pattern, there is no need to set an inappropriate feed amount, and a stitch pattern with a good appearance is always formed.
In addition, to briefly explain the case of performing nail hole stitching, in this case as well, by rotating the selection knob 98 in the same manner as described above, the first cam follower 19 is connected to the basic cam in the pattern cam 5. 5a or two half-amplitude cams having different swing movement ranges of the needle, and the second cam follower 20G selectively engages with the feed control cams 13 to 15.

Therefore, the amplitude and feed amount that are automatically set by selecting the stitch pattern from top to bottom shown in FIG. 13 correspond to the values marked with circles in the table of the same figure. The amplitude and feed amount can be adjusted in the same way as described above, but the feed amount in the case of a loose stitch is always 0 regardless of whether the second manual knob S5 is rotated or not. This is obvious from the fact that the adjustment cam surface 14a of the feed control cam 14 is formed into a cam surface with an equal radius.Furthermore, when adjusting the amplitude and feed amount, the first and second manual knobs 26, 65 Once locked at the desired movement position, both manual knobs 26, 65 return to their original positions even if the selection knob 98 is rotated to form each part of the plowhole overlock. Therefore, as shown in FIG.
2 is provided. Next, a case will be described in which the selection knob 98 is operated to form a stitch pattern of ``nu'' or ``ru'' as shown in FIG. 13.

In this case, the first cam follower 19 engages with the pattern cam corresponding to the stitch, and the second cam follower 19 also engages with the automatic feed control cam 8. 26,6
5 and 31 are returned to the positions shown in FIG. When the sewing machine is operated in this state, the automatic feed control cam 8 rotates in conjunction with the main shaft 1, and the second cam follower 20 swings according to the shape of the cam. The oscillating movement is transmitted to the feed regulator 58, causing it to oscillate. Therefore, the feed motion of the feed dog is automatically controlled, and the stitch pattern N or F, in which the feed motion changes periodically, is formed with maximum amplitude. In this case, operating the first manual knob 26 changes the width of the stitch pattern, but operating the second manual knob 65 does not change the feed amount. This is because, although the feed control cams 11 to 15 are rotated by operating the manual knob 65, since the second cam follower 20 is not engaged with the cams, the cam surfaces 11a to 15a are This is because it is not affected. Therefore, no matter what position the manual knob 65 is moved, the feed control cam 8' causes a predetermined feed movement regardless of the moved position. Although this embodiment has the configuration and operation mode as described above, the present invention is not limited to this embodiment.

For example, although the second manual knob 65 in the above embodiment is a Moslem type, it is also possible to adopt a sliding type in an upward direction or a horizontal direction. Further, instead of the single cam following method as in the above embodiment, the sewing machine may be provided with a cam selection means of a so-called multiple cam following method.
As described in detail above, the present invention allows the user to select a desired stitch pattern. , and in that state, the feed determined to be optimal for the selected stitch pattern through a cam follower that selectively engages with cam parts formed at the same angular position of a plurality of feed control cams. Since the amount is automatically set according to each stitch pattern, there is no need to adjust the feed amount at all, simplifying the operation of the sewing machine, and even inexperienced stitchers can easily use the sewing machine.

Then, a person skilled in operating a sewing machine can move the manual operation member body from the predetermined position in one direction or another direction against the action of the holding means, as necessary, to control the feed control cam. is rotated so that the cam follower loosely engages the adjusting cam surface on the cam part, whereby the feed rate can be gradually increased or decreased relative to the automatically set feed rate, and the manual Since the operating body is locked at the moving operation position by the action of the locking means against the action of the holding means, the selected stitch pattern can be formed with an appropriate feed amount, and the stitch pattern is not unsatisfactory. It is extremely practical and requires no memorization. Furthermore, since the feed amount that can be adjusted by the movement of the manual operation unit can be determined by the shape of the feed adjustment cam surface of the feed control cam, the feed adjustment range that is determined to be appropriate for each stitch pattern can be determined. The stitch pattern can be set in advance so that even if an unskilled person moves the manual operation member, the feed amount will not be inappropriately changed for the selected stitch pattern, and therefore the stitch pattern always has a good appearance. Furthermore, when the cam selection means is operated to form another stitch pattern, the action of the locking means is appropriately released, and the manual operation member that was locked at the moving position is moved. The holding means moves the body back to the predetermined position and automatically sets the feed amount according to the newly selected stitch pattern. To provide a zigzag sewing machine that is extremely easy to use, without the need to return to the localization layer, without any troublesome adjustment of the feed amount.

[Brief explanation of drawings]

The drawings show one embodiment embodying the present invention.
The figure is a front view showing the external appearance of the sewing machine, Figure 2 is a plan view with the top cover removed, Figure 3 is a cross-sectional view taken along line mm in Figure 2, and Figure 4 is a cross-sectional view taken along line W-W in Figure 2. Figure 5 is V- of Figure 2.
Figure 6 is a cross-sectional view along line V in Figure 2, Figure 7 is a cross-sectional view along skin-to-skin line in Figure 2, Figure 8 is a cross-sectional view along Hadaichiyanagi line in Figure 3, Figure 9 is a sectional view taken along line K-K in Figure 2, Figure 10 is an enlarged front view showing the second manual knob, and Figure 11 is a diagram for explaining the shape of the feed adjustment cam surface of the feed control cam. Enlarged view ``Figure 12 is a line diagram for explaining the shape of the feed adjustment cam surface of the feed control cam'' ``Figure 13 is a diagram for explaining the settings of the amplitude, feed amount, etc. for the selected stitch pattern'' In the figure, 1 is the main shaft of the sewing machine, 5 is a pattern cam, 11 to 15
is a feed control cam, and 11a to 15a are feed adjustment cam surfaces.
11b to 15b are cam parts, 19 is a first cam follower, 20 is a second cam follower, 58 is a feed adjuster, 61 is a lotus birch, 62 is a connecting arm, 64 is an operating shaft, and 65 is a manual knob. , 66 is a locking disk, 68 is a locking tooth, 70' is a rotating arm, 7
The turtle has working arms? 2 is lotus birch, 73 is a protruding pin, 74 is a connecting plate, 75 and 78 are tension springs, 79 is a locking bar, 81 is a locking pin, 82 is a tension spring, 98 is a selection knob, 99 is a first The operating cam, 100 is the second operating cam, 101 is the release cam, 102 is the first selection cam, and 103 is the release cam.
104 is a second selection cam, 105 is a contact lever, 109
1 is a release lever, 113 is a first moving lever, 104 is a second moving lever, 123 is a release arm, and 126 is a rod. Figure 6 Figure 9 Figure 0 Figure 11 Figure 12 Figure 13

Claims (1)

[Claims] 1 A plurality of pattern cams arranged in parallel on one axis and driven to rotate in conjunction with the main shaft of the sewing machine for horizontal swing movement of the needle, and a pattern cam that selectively engages with the pattern cam to follow the shape of the cam. a first cam follower for imparting a lateral rocking motion to the needle; and a feed adjustment cam surface arranged in parallel on the axis of the pattern cam or on an axis parallel to the axis and having different feed adjustment cam surfaces, respectively. a plurality of feed control cams rotatable independently of rotation of the main shaft; a feed control cam operatively connected to a feed adjuster for adjusting the feed movement of the feed dog and selectively engaged with the feed control cam; a second cam follower, a manual operation member operatively connected to the feed control cam and for rotating the feed control cam by an operation from outside the sewing machine frame to operate the feed adjuster; cam selection means that can be manually operated from outside the sewing machine frame in order to engage the first and second cam followers with cams corresponding to desired stitch patterns in the pattern cam and the feed control cam, respectively; In the zigzag sewing machine, a holding means including a spring means for biasing the manual operation member toward a predetermined position within its operation range and always holding the manual operation member at that position; and the manual operation member. a locking means for locking the manual operation member at the moved position when the manual operation member is moved from the predetermined position to another position against the action of the holding means;
In order to always release the action of the locking means in connection with the operation of the cam selection means, a coupling means is provided for operatively connecting the cam selection means and the locking means, and the manual With the operating body at the predetermined position, the feed amount and feed direction determined to be optimal for forming the stitch pattern are set at the same angular position of the plurality of feed control cams that can be engaged by the second cam follower. a feed amount that is adjusted via the second cam follower when the manual operation body is operated to move in a certain direction from the predetermined position within its operation range; is continuous with the cam part such that the amount of feed gradually decreases from the set feed amount at the predetermined position, and conversely increases gradually when the manual operation part body is operated to move from the predetermined position to another direction. A feed adjustment cam surface is formed on each of the plurality of feed control cams, and the manual operation body is always located at the predetermined position when the cam selection means is operated to select a desired stitch pattern. The feed amount and feed direction are automatically set according to the selected stitch pattern, and the manual operation body can be moved from the predetermined position to a certain direction or another direction as necessary. An automatic feed setting device characterized in that the feed amount can be changed as appropriate so that the feed amount is gradually decreased or increased with respect to the automatically set feed amount.