JPS6068B2 - Automatic feed setting device for zigzag sewing machine - 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 member is always moved to a predetermined position, and the feed amount and feed direction that are determined to be optimal for forming the selected stitch pattern are automatically set according to each stitch pattern, and as necessary. A feed amount different from the automatically set feed amount can be appropriately manually set by moving the manual operation member within another operation range apart from the predetermined position. It is characterized by the following.

As a conventional automatic feed setting device of this type, there is a device previously proposed by the present applicant in Japanese Patent Application No. 52-9928.

In this device, the manual operation body for operating the feed adjuster is held at a predetermined position within the operation range each time a new stitch pattern is selected, and The adjuster is configured to set the feed amount determined to be optimal according to each selected stitch pattern, and the manual operation unit can be moved from a predetermined position to adjust the feed adjustment to be gentle or automatic as described above. The feed rate is configured to be changed for each stitch pattern so as to be appropriately increased or decreased within an adjustment range suitable for forming the stitch pattern. It is extremely practical for automatic setting of the optimum feed amount when selecting the feed amount, and for subsequent manual setting of the feed amount as necessary. When this happens, the feed amount set at that movement position differs depending on the selected stitch pattern. It is only possible to recognize the extent to which it decreases and increases relative to the feed amount.

Therefore, after forming one stitch pattern with the manually set feed amount, forming another stitch pattern, and then trying to form the previously formed stitch pattern again with the same feed amount. When doing so, the disadvantage is that the exact same stitch pattern cannot be formed because the guideline for returning the manual operation member to its original position cannot be determined numerically.The present invention has been developed in view of the above circumstances. The purpose of this is to enable the user to select the desired stitch pattern by simply selecting the desired stitch pattern, and the feed rate determined to be optimal for the selected stitch pattern is determined for each stitch. It is automatically set according to the grain pattern, and when setting the feed amount manually, it is a practical and extremely convenient method that can be set arbitrarily while recognizing the feed amount numerically, just like before. Our goal is to provide an easy-to-use zigzag sewing machine.

Therefore, in the present invention, each time a new stitch pattern is selected, the manual operation unit for operating the feed adjuster
The feed adjuster is held at a predetermined position apart from the normal operating range for setting the feed amount arbitrarily within the range of adjustment from 0 to the maximum, and at that predetermined position the feed adjuster is applied to each selected stitch pattern. It is configured to set the feed amount that is judged to be optimal according to the situation, and when the operator wants to change or adjust the feed amount arbitrarily, the manual operation unit is moved from its predetermined position to within the normal operation range. Thus, just like a conventional general zigzag sewing machine, the sewing machine is constructed so that the set feed amount can be recognized numerically and adjusted.

An embodiment embodying the present invention will be described in detail below with reference to the drawings.

Drawing 1 shows a main shaft of a sewing machine supported on a sewing machine frame 2; 3 is a camshaft inserted into and fixed to the machine frame 2; 4 is a plurality of pattern cams 5 for imparting lateral swing motion to the needle; is an automatic feed control cam for periodically changing the feed motion of the feed dog, and both cams 4 and 5 are integrally supported by a steel insert on the camshaft 3 together with a gear 6, and are fixed to the main shaft 1. The meshing of the gear 7 with the gear 6 causes the machine to rotate at a reduced speed in conjunction with the main shaft 1 of the sewing machine. Reference numerals 8 to 12 designate five feed control cams which are supported by iron on the cam shaft 3, and are made of synthetic resin material. The automatic feed control cam 5 is integrally formed with the automatic feed control cam 5 and can be rotated independently of the automatic feed control cam 5.

Further, ``13 is a fixed shaft supported by the sewing machine frame 2 in parallel with the camshaft 3, and 14 and 15 are substantially U-shaped shafts in plan view that are swingably connected to the fixed shaft 13. The first and second swing frames are mounted so as not to move in the direction of the ball. 16917 is attached to the fixed shaft 13 so as to be located inside the first and second swing frames 14 and 15, respectively. The base ends of the first and second cam followers are inserted, and the base ends are also inserted into the connecting rods 18 and 18, which are respectively fixed to the swing frames 14 and 15 in parallel with the fixed shaft 13, respectively. The pattern cam 4 and the feed control cam 5 are rotated integrally with the swing frames 14 and 15, and can be moved within the frames in the rutting direction.
, 8 to 12 can be selectively engaged with any one of the cams.

Next, to explain the cam selection means, the auxiliary machine frame 201 is fixed to the sewing machine frame 2, the operating shaft 21 is rotatably supported by the auxiliary machine frame 201, and the operating shaft 21 is rotatably supported by the auxiliary machine frame 201. Selection knobs 23 and 24 fixed to one end and located on the right side of the sewing machine frame 2 are used to determine the axial movement positions of the first and second cam followers 16 and 17, respectively. 1 and 2 selection cams, 25 a release cam which performs the function described later, 26 both cam followers 16, 1
7 from the pattern cam and the feed control cam, and these four cams 23 to 24 are integrated with a spacer between them to separate the control cam 2 from the pattern cam and the feed control cam.
11 pieces are fixed.

Reference numeral 27 denotes a first moving lever rotatably mounted on the auxiliary machine frame 20 by a step screw 28, and the upper end thereof is connected to an annular groove formed at the base end of the first cam follower 16. A matching pin 29 is fixed, and a contact pin 30 facing the first selection cam 23 is fixed at the intermediate portion.

Reference numeral 31 denotes a second moving lever rotatably supported by a pivot shaft 32 fixed to the auxiliary machine frame 201, and the upper end thereof has an annular groove formed at the base end of the second cam follower 17. A pin 33 is fixed thereto, and a contact head 31a facing the second selection cam 24 is provided at the intermediate portion.

A tension spring 34 is provided between the two moving levers 2T and 31.
is stretched, and brings the contact pin 30 and the contact head 31a into contact with the first and second selection cams 23 and 24, respectively. Reference numeral 35 denotes a release lever rotatably supported by the auxiliary machine frame 2 shaft 36, and a contact head 35a is provided in the middle part of the release lever.
is formed, and the first and second swing frames i4 are formed at the tip portions.
, 15 facing each one side edge 14a, 15a of the twill screw 3
7 and 38 are each adjustable and fixed, and the contact head 35a engages with the lift cam 26 by the action of a coil spring 39.

Therefore, when the selection knob 22 is rotated, the release lever 35 is first rotated by the lift cam 26 against the action of the coil spring 39, and the two swing frame frames 4 are rotated via the abutting screws 37 and 38. , 15 to separate the first and second cam followers 16, 17 from the pattern cam and the feed control cam, respectively, and then rotate the first and second selection cams 23.
, 24, the moving levers 27, 31 are rotated, and the cam followers 16 and the corner 7 are moved along the fixed shaft 13 to select any desired cam. The operation of the cam is well known, and further explanation will be omitted, but the stitch pattern corresponding to the selected cam is displayed on a pattern display board (not shown) located at a suitable location on the sewing machine frame. Of course, the instruction is given by a pointer (not shown) that moves in conjunction with the rotation of the selection knob 22. Next, referring to FIGS. 1 and 3, reference numeral 40 denotes a first rotation shaft supported on a shaft bearing portion of a joint plate 41 fixed to the front surface of the pillar portion of the sewing machine frame 2; 43 is a first manual knob fixed to the outer end of the rotating shaft 40; 43 is a first manual knob fixed to the outer end of the rotating shaft 40;
A locking disk 44 is fixed to the inner end of the rotation shaft 40.
A rotating arm supported by a free iron on the holder, which faces the locking disc 43 via a supporting screw 44a so as to be engageable with the locking disc 43, and a coil spring mounted between the rotating arm 44 and the joint plate 41. 45, the rotating arm 44 is urged counterclockwise in FIG.
The first manual knob 42 and the locking disc 43 are connected to the sixth
It is biased counterclockwise in the figure.

Reference numeral 46 denotes a regulating pin fixed to the baffle plate 411, which iron-fits into an arcuate slot 42a formed in the first manual knob 42, thereby regulating the rotation range of the manual knob 42.

47 is a support plate fixed to the sewing machine frame together with an adjustment plate 49 via screws 48; 50 is a support plate 47 connected to a pivot 51
This is a swinging link which is pivotally connected together with the connecting arm 52. Both 50 and 52 are fixed by a rear screw 54 whose relative position is adjusted by an adjusting screw 53, and swing together. One end faces a pin 55 provided on the other side of the first swing frame 14 .

Reference numeral 56 denotes a needle rod having one end supporting a rod 57 that engages with the engagement green 50a of the swing link 50 and the other end connected to a needle support frame (not shown). Moving arm 44
is connected to the pivot point of the swing link 50 by rotating the first manual knob 42.

The amount of lateral swinging momentum imparted to the needle can be adjusted by changing the position of the swinging link 50.
, rollers 57, etc. constitute an amplitude adjuster.

and a spring means (not shown) provided between the needle support frame and the sewing machine frame for biasing the support frame in one direction.
Due to this action, the roller 57 of the needle shank 56 always engages with the engagement edge 50a of the swinging link 50, and also connects to the first swinging frame 14 via the connecting arm 52 counterclockwise in FIG. A rotational force is applied in all directions, so that the first cam follower 16 is always pressed against the pattern cam 4. Reference numeral 59 is an adjustment screw that can be engaged with the upper edge of the needle lotus root 56.
7 serves to prevent the swing link 50 from exceeding the pin point. Further, referring to FIGS. 2 and 4, reference numeral 60 denotes a second rotation shaft supported in the groove bearing portion of the joint plate 41, and 61G
A second manual knob 62 is fixed to the outer end of the shaft, and an operating cam body 6 is fixed to the inner end of the second manual knob 60.
Reference numeral 3 denotes a retaining disk fixed to rotate together with the operating cam body 62; 64 is a coil spring installed between the retaining disk 63 and the decorative plate 41; The manual knob 61 is biased counterclockwise in FIG.
The rotation range of the second manual knob 61 is regulated by a regulating pin 65 that is aligned with an arcuate slot 61a formed in a second manual knob 61 fixed to the second manual knob 61.

Reference numeral 66 denotes an operating arm rotatably supported by the operating shaft 21, one end of which is connected via a rod 67 to a connecting plate 68 fixed to the feed control cams 8 to 12; and the sewing machine frame 2.
9 is biased counterclockwise in FIG.
A pin 70 fixed to the other end engages with a first cam surface 62a formed on the operating cam body 62.

71 is a planar U-shaped mounting plate fixed to the sewing machine frame 2; 72 is a second operating shaft rotatably supported by the mounting plate 71; and 73 is a second operating shaft rotatably supported by the operating shaft 72. One end of the supported intermediate lever is connected to the other side of the second swing frame 15 via a rod 74, and a linking pin 75 is fixed to the other end.

76 is a feed adjustment shaft to which a known feed adjuster (not shown) is fixed to one end, and 776 is a linking arm fixed to the other end of the feed adjustment shaft 76. Reference numeral 8 denotes an engagement pin adjustably fixed to the bent portion of the distal end of the linking arm 77, and includes a track means (not shown) that applies rotational force to the feed adjustment shaft 76 in the direction of arrow D in FIG. ) is in contact with the steering pin 75.

Therefore, the intermediate lever 73 is given a rotational force counterclockwise in FIG. 2, and the second swing frame 15 is biased clockwise in FIG. 4 via the rod 74. The second cam follower 17 is always in pressure contact with the feed control cam. Further, referring to FIG. 5, "the second operating lever 72 includes a feed reversing lever 79 that can be manually operated from outside the sewing machine frame, and a feed reversing lever 79 that is opposed to the second cam surface 62b of the operating cam body 62. An engaging arm 81 to which a pin 80 is fixed, and a movable arm 83 having a bent portion 83a opposite to an abutment screw 82 adjustably fixed to the intermediate lever 73 are fixed to each other. A clockwise rotational force in FIG. 2 is applied to each of the plate 71 and the engagement arm 81 by the action of a coiled spring 84 installed between the plate 71 and the engagement arm 81.

Further, between the feed reversal lever 79 and the mounting plate 71, another manual operation lever 85 and an operating lever 86 are connected with a screw 8.
7 and is rotatably supported around an operating shaft 72, and as shown in FIG.
Due to the action of a tension spring 88 stretched between one end and the sewing machine frame 2, the bent portion 86a of the operating lever 86 is biased clockwise in the figure, and the bent portion 86a engages with the lower edge of the mounting plate 71. By doing so, it is always held in the position shown in the figure. An operating portion 85a is bent at the tip of the manual operation lever 85 and extends over the middle portion of the feed/reverse lever 79, and an interlocking screw 89 (see FIG. 1) is adjustably fixed to the feed/reverse lever 79. ) is in contact with the operating portion 85a, so that the feed/reverse lever 79, the engaging arm 81, and the moving arm 83 are always held in the position shown in FIG. 2 against the action of the coil spring 84. . Furthermore, referring to FIGS. 1 to 3, reference numeral 90 denotes a linking lever that is rotatably attached to the auxiliary machine frame 201 by a pivot 91, and a pin 92 fixed to one end of the linking lever 90 is fixed to the operating lever 86. pin 93
The other end is connected to the rotating arm 44 via a link 94.

Reference numerals 95 and 96 denote first and second locking arms rotatably mounted by step screws 97 and the pivot shaft 91, respectively, and compression springs 98 are attached to the peripheral surfaces of the locking discs 43 and 63 at their tips.
Locking portions are formed that engage with each other by the action of the above.

Therefore, when the first and second manual knobs 42 and 61 are rotated, the manual knobs are rotated together with the rotating arm 44 or the operating cam body 62 and the coiled spring 45 or 6
In order to ensure the locking action, knurling is formed on the circumferential surface of each of the locking discs 43 and 63, respectively. Also,
A release arm 99 is rotatably supported by the pivot shaft 32 of the auxiliary machine frame 2, and its contact head 99a is also engaged with the release cam 25 by the action of a coil spring 100. The engaging portions 95a of both the locking arms 95, 96,
It faces 96a from above. In the figure, a handwheel 02 fixed to the main shaft 1 at 101' is a pulley for driving the main shaft 1, and is connected to the sewing machine motor via a belt 103.

The feed setting mechanism will be described in more detail with reference to FIGS. 2 and 6 to 8. The second manual operation knob 61 is rotated by the action of the coil spring 64, and the regulating pin 65
is attached to one side of the arcuate slot 61a, and the symbol A marked on the front of the manual knob 61 is displayed.
matches the index 105 carved on the joint plate 41, and the actuating arm 6
Pin 7 of 6 First cam surface 62a of operating cam body 62
and engages at angular position Ra.

In that state, the second cam follower 17
can be selectively engaged relative to the feed control cams 8 to 12 at the same angular position Pa, and at the same angular position Pa, cam portions 8a to 15a whose distances from the yaw line of the cam 13 are different from each other are located at the same angular position Pa. formed on each cam. Further, as described above, the second manual knob 61 can be rotated clockwise in FIG. By operating the pin 7 of the actuating arm 66 to match the index 105, the angular position Rb is adjusted to the first cam surface 62a of the actuating cam body 62.
The feed control cams 8 to 12 are rotated according to the shape of the cam surface. Therefore, within the operating range, the second cam follower 17 can be selectively engaged with the feed control cams 8 to 12 within the angular range Q from angular positions Pb to Pc. In L, the three feed control cams 8 to 101 are formed with the same feed adjustment cam surfaces 8b to 10b, and the second cam follower 17 engages with these force surfaces at the angular position Pc. The feed amount is set to 0 when engaged at the angular position Pb, and the feed amount is set to the maximum when engaged at the angular position Pb.Furthermore, the fourth feed control cam 11 is used for sewing the button hole gate, which will be described later. The feed adjustment cam surface 11b within the angular range includes the cam portion 11a at the angular position Pa, and is formed into a cam surface with an equal radius centered on the axis of the camshaft 13. 11b and the cam follower 17 engages with the cam portion 11a, the feed nose is set to zero.Furthermore, the feed adjustment cam surface 12b within the angular range Q of the fifth feed control cam 12 is at the angular position Pc. It is formed so as to be symmetrical with the same cam surfaces 8b to 10b with respect to the cam surface 11b in the range from Pb to approximately the middle toward Pb.
b is used to set the reverse feed amount when the feed reversal lever 79 is rotated counterclockwise in FIG. The reverse feed amount is set to be equivalent to the normal feed amount set for 10M to 10M.

Additionally, an indicator is marked on the front of the first manual knob 42, and when the manual knob is rotated to the maximum counterclockwise direction by the action of the coil spring 45 (see Fig. 3), the display Symbol 5 matches the index 106 engraved on the decorative plate 41.'' In this state, the roller 57 of the needle bar 56 engages with the engagement edge 50a of the swing link 50 at the position farthest from the pivot 51 ( (see Figure 1), the zigzag amplitude is set to maximum.
The present embodiment is configured as described above, and its operating mode will be explained below.

First, a case will be described in which the selection knob 22 is rotated to select the stitch pattern opening shown in FIG. 9 to perform zigzag stitching.

In this case, the first cam follower 16 engages with the zigzag basic cam 4a in the pattern cam 4 (see FIG. 1), and
The second cam follower 17 engages the feed control cam 8, and the first manual knob 42 is positioned to set the maximum amplitude 5. i05. Therefore, the second cam follower 17 engages with the cam portion 8a of the feed control cam 8 at the angular position Pa, and the rod 74 and the intermediate lever 7
3. The feed adjuster is operated to set the intermediate feed amount 2 via the linking arm 77 etc. When the sewing machine is operated in this state, the pattern cam 4 rotates in conjunction with the main shaft blade, and the first As is clear from the figure, the first cam follower 16 engaged with the zigzag basic cam 4a swings integrally with the swing frame 14, and the swing link 50 is connected via the connecting arm 52. rock it,
The needle support frame swings via the needle support link 56, imparting a lateral swinging motion to the needle. Its swinging momentum is maximum because the rollers 57 of the needle link 56 are located farthest from the pivot 51 of the swinging link 50. Therefore, the maximum amplitude is 5.
, zigzag stitching can be performed with a medium feed amount of 2. by the way,
To reduce the lateral rocking movement of the needle, when the first manual knob 42 is rotated, the locking disk 43 shown in FIG. The rotating arm 44 is forcibly rotated against the action of the coil spring 4.
5 and rotates against the action of roller 57 via link 58.
The pivot 51 of the swing link 50 also approaches. When the rotation operation of the first manual knob 42 is released, the locking disc 43 and the locking arm 95 work together based on the action of the compression spring 98, so that the manual knob 42 is moved by the action of the coil spring 45. It is locked in any rotational position against the Therefore, the amplitude of the stitch pattern opening can be manually adjusted arbitrarily between 0 and 5. Also, if you want to change the feed amount, just rotate the second manual knob 61. .

That is, when the manual knob 61 is rotated clockwise in FIG.
Due to the action of a, the actuating arm 66 is rotated clockwise in FIG. 2, and the feed control cam 8 is rotated together with the other feed control cams 9 to 12 via the rod 67. When the manual knob 61 is released with the indicator 105 matching one of the symbols 0 to 4 on the display, the compression spring 98 between the locking disc 63 and the second locking arm 96 is released. Due to the action-based cooperation, the manual knob 61 is locked in its pivoted position against the action of the helical spring 64. In this position, the second cam follower 17 engages with the adjustment cam surface 8a of the feed control cam group 1 within the angular range Q. A feed adjuster fixed to the feed adjustment shaft 76 is operated to set the feed amount corresponding to the display on the manual knob 61. For example, symbol 4 on the display of the manual knob 6 is the index I.
In a state that meets D5, the pin 70 of the actuating arm 66 is at an angular position Rb with the first cam surface 62a of the actuating cam body 62.
the second cam follower 17 engages with the adjusting cam surface 8b of the feed control cam 8 at the angular position Pb;
A maximum feed amount of 4 is set. In this way, by rotating the manual knob 61, the feed amount of the stitch pattern opening can be changed from 0 to 4.
can be arbitrarily adjusted between. After performing the zigzag stitch, when the selection knob 22 is rotated to form another stitch pattern, for example, stitch pattern 2 shown in FIG. 9, the lift cam 26 and the first selection cam 23 Due to this action, the first cam follower 16 engages with the pattern cam corresponding to the stitch pattern 2, and the second cam follower 17 engages with the other feed control cam 9.

On the other hand, at the beginning of the rotation of the operating shaft 21, the release arm 99 is rotated counterclockwise in FIG. The locking arms 95 and 96 are rotated against the action of the compression spring 98, and the locking action on the locking discs 43 and 63 is released. As a result, even if the first and second manual knobs (42, 61 are moved to arbitrary rotational positions during the above-mentioned zigzag sewing), due to the action of the coil springs 45, 64, as shown in FIG. In this state, the second cam follower 17 engages with the cam portion ga of the feed control cam 9 at the angular position Pa, and the feed adjuster is operated to adjust the feed amount to a small feed of 1. , and when the sewing machine is operated, stitch pattern 2 is formed at the maximum amplitude of 5 and small feed 1. If you want to change the amplitude,
As described above, this can be done as appropriate by rotating the first manual knob 42, and the locking disc 4 can be placed in that rotation position.
3 and the locking arm 95. Further, if you want to change the feed amount, by operating the second manual knob 61, the feed adjustment cam surface 9 of the feed control cam 9 shown in FIG.
The feed amount can be changed according to a, and the feed amount adjustable range in this case is also from 0 to the maximum feed of 4. Furthermore, when it is desired to form a seam desert-like ho or he as shown in FIG. 9, as described above,
When the selection knob 22 is rotated to select the stitch pattern, the first and second manual knobs 42, 6 are activated in the same manner as described above.
1 is released via the release cam 25 and the release arm 99, and each manual knob returns to its predetermined original position by the action of the coil springs 45 and 46, respectively. and"
The first cam follower 16 engages a corresponding cam in the pattern cam 4 and the second cam follower 17 engages a further feed control cam 10. Therefore, as in the case described above, the symbol A of the second manual knob 61 is indicated by the index 105.
However, due to the engagement between the second cam follower 17 and the cam portion 10a of the feed control cam 10 at the angular position pupil Pa, the feed adjuster adjusts the feed amount. The sewing machine is operated to set the minute feed F. When the sewing machine is operated in this state, the stitch pattern is formed at the maximum amplitude of 5 and the minute feed F. Also, in this case, the second manual By rotating the knob 61, the feed adjustment cam surface 10b
The feed amount can be arbitrarily changed between 0 and 4 based on . By the way, when you want to perform straight twill stitching, after selecting the stitch pattern opening shown in FIG. 9, turn the first manual knob 4.
2 and set the swing amplitude of the needle to 0 by aligning the symbol 0 on the display with the index 106.
Although straight line totalization is possible in this example, it is also possible in the following manner in this embodiment.

That is, if straight stitch A is selected by operating the selection knob 22, the first cam follower 16 engages with a round cam of equal radius in the pattern cam 4, and the second cam follower 17 engages with the round cam of the pattern cam 4. It engages with the feed control cam 8. When the selection knob 22 is operated, the first and second manual knobs 42, 61 return to their original positions shown in FIG. 6, as in the case described above.
It is held in that position. If the sewing machine is operated in this state, the swing link 50 will not swing at all due to the action of the round cam, so that the sewing machine can perform straight line sewing at an intermediate feed amount of 2. ``It is clear that there is no effect even if the first manual knob 42 is moved from its original position to another position.As described above, when forming stitch patterns A to t, select t. By rotating the knob 22, the second manual knob 62 always moves back to the predetermined position, and the second cam follower 17
is selectively engaged with the feed control cams 8 to 10 at the same angular position Pa, and the cam portions 8a to 10a of each cam automatically adjust the feed amount determined to be optimal for the selected stitch pattern. The second cam follower 17 and the feed adjustment cam surfaces 8b to 10b can be selected by operating the second manual knob 61 within other operating ranges from the predetermined position. The feed amount can be manually changed arbitrarily within the range of 0 to 4 through target engagement.

By the way, the feed reversing lever 79 is used to reverse the feed.
The case where is operated will be explained with reference to FIGS. 2 and 5.

A desired stitch pattern is selected by operating the selection knob 22, and with the first and second manual knobs 42, 61 in their original positions shown in FIG. When pressed in the counterclockwise direction in FIG.
The intermediate lever 73 also rotates in the same direction through the engagement between the abutment screw 82 and the abutment screw 82, and the linking arm 77 rotates together with the feed adjustment shaft 76. Then, the pin 80 of the engaging arm 81 comes into contact with the second cam surface 62b of the operating cam body 62 at the angular position Ra shown in FIG.
6 is prevented from rotating further, and the feed adjuster is held to set the reverse feed by the intermediate feed 2 according to the height of said second cam 62b at the angular position Ra. Therefore, when the sewing machine is operated, a reverse feed process with a feed amount of 2 is performed. This is because there is a high possibility that reverse stitching will be performed in the stitch pattern A and the opening, and the automatically set feed amount when that stitch pattern is selected is 2, so this is an amount equivalent to the feed amount. The reverse feed is set when the reversing lever 79 is operated, but the angular position P of the second cam surface 62b
By changing the height at a, an arbitrary reverse feed amount can be set. Then, the second manual knob 61 is rotated, the operating cam body 62 is rotated, and the feed control cam is activated through engagement between the first cam surface 62a and the pin 70 of the operating arm 66. 8 to 12, and its feed adjustment cam surface 8b
When the feed amount is arbitrarily set through selective engagement between 10b to 10b and the second cam follower 17, the feed reversal lever 7
9, the pin 8 of the engaging arm 81 comes into contact with the second cam surface 62b at opposing angular positions between the angular positions Rb and Rc shown in FIG. Reverse feed sewing is possible with a feed amount equivalent to the amount of stitching. Further, the case of performing tacking will be described with reference to FIGS. 1, 2, and 5.

With the first and second manual knobs 42, 61 held in their original positions as shown in FIG. 6, the manual operating lever 85 is rotated counterclockwise in FIG. 2 by pressing its operating portion 85a. Then, the operating lever 86 rotates together against the action of the tension spring 88, and the feed/reverse lever 79 also rotates in the same direction as the operating shaft 72 via the linking screw 89 shown in FIG. be done. and pin 93 of actuating lever 86
The operating lever 90 is rotated clockwise in FIG.
4, the rotating arm 44 is moved together with the link 58 against the action of the coiled spring 45, and the upper green part of the needle shank 56 comes into contact with the adjusting screw 59, thereby preventing the subsequent movement of each member. be done. In this state, the roller 5 of the needle bar linkage 56
7 coincides with the pivot shaft 5 of the swing link 50, and the pin 80' of the engaging arm 81 is spaced apart from the second cam surface 62b of the operating cam body 62 at the angular position Ra. ``When the sewing machine is operated, a straight line is executed with minute forward feed, and a stop warp is formed.The first and second manual knobs 42 and 61 are rotated to adjust the amplitude and feed amount as desired. Even if the manual operation lever 85 is set to
It is clear from the above description that if the manual knobs 42 and 61 are operated, the trowel tacking can be performed by linear and minute forward feed, regardless of the operating positions of the manual knobs 42 and 61. In this way, it is possible to easily complete the stitching at the start and end of sewing, but when performing the stitching, the rotating arm 44 is rotated against the action of the coil spring 45, but the locking The disc 43 is locked by the action of the first locking arm 45, and when the manual operation lever 85 is released, the rotating arm 45 returns and its supporting screw 44a is locked in the locking circle. The amplitude determined by the first manual knob 42 that engages the plate 43 is set again. Next, to briefly explain the case of performing L gold hole drilling, in this case as well, by rotating the selection knob 22 in the same manner as described above, the first cam follower 16 It selectively engages with the basic cam 4 4a or two half-amplitude cams with different needle swing motion ranges, and selectively engages with the second cam follow-up pre-reinforcement 7G and feed control cams 10 to 12. do. Therefore~9th
The amplitude and feed amount that are automatically set when the stitches shown in the figure are selected 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 manner as described above, but the feed amount when the seam pattern is selected to form the stopper part of the button hole is adjusted by the second manual knob 61. It is clear that the value is always 0 regardless of the rolling operation, since the adjusting cam surface 11b of the feed control cam 11 is formed as a cam surface with an equal radius including the cam portion 11a. In addition, when adjusting the front plow amplitude and feed amount, once the first and second manual knobs 42, 61 are rotated and locked at the required movement position, the plow hole Even if the selection knob 22 is rotated to form each part, it is necessary to prevent the front and rear knobs from returning to their original positions as shown in FIG. 6 in order to repeatedly form the same gold hole. Therefore, as shown in Fig. 3, the release cam 2
5 is provided with a flat portion 25a that does not operate the release arm 99. Furthermore, the formation of the edge of the nail hole is usually done using a minute feed mechanism, and the left and right edges need to be formed with the same amount of feed in different feed directions in order to improve the appearance of the nail hole. be. Therefore, when the stitch pattern or beam is selected and the second manual knob 61 is rotated so that the displayed symbol 0 to 1 matches the index 105, the second cam tracking is performed. The adjusting cam surface 12b and the arm ob, which the child 17 engages with to set the feed amount, are shaped so that the feed amount is set to be the same at the same angular position, although the feed direction is different. Finally, a case will be described in which the selection knob 22 is operated to form the stitch pattern ``nu'' or ``ru'' shown in FIG.

In this case, the first cam follower 16 engages the pattern cam corresponding to the stitch, the second cam follower 17 engages the automatic feed control cam 5, and the first and second manual Knob 42
, 61 are returned to the positions shown in FIG. When the sewing machine is operated in this state, the automatic feed control cam 5 rotates in conjunction with the main shaft 1, and the second cam follower 17 swings according to the shape of the cam. The rocking motion is the rocking frame 1
5. The rod 74 is transmitted to the feed adjuster through the intermediate lever 73, the connecting arm 77, the feed adjustment shaft 76, etc., and swings the adjuster. Therefore, the feed movement of the feed dog is automatically controlled. The stitch pattern N or F, whose feeding motion changes periodically, is formed at maximum amplitude.In this case, the width of the stitch pattern changes by operating the first manual knob 42; Even if the second manual knob 61 is operated, the feed amount does not change.This is because, although the feed control cams 8 to 12 rotate by operating the manual knob 61, the second cam follower 17 Because it is not engaged with the cam surface, it is not affected by the cam surface in any way. Therefore, even if the manual knob 61 is moved to any position, the automatic feed control cam 8 will not engage the manual knob 61. A defined feed movement occurs.Although this embodiment has the configuration and operating mode as described above, the present invention is not limited to this embodiment.

For example, although the second manual knob 61 in the above embodiment is a rotating type, it is also possible to adopt a sliding type in the vertical direction or in the lateral direction. It is also possible to embody a sewing machine equipped with a cam selection means of a so-called multiple cam follower system instead of the L method. When operated, the manual operating body for operating the feed adjuster is always moved to a predetermined position by the action of the holding means, and in this state, the cams formed at the same angular position of the plurality of feed control cams The feed amount determined to be optimal for the selected stitch pattern is automatically set according to each stitch pattern through the cam tracking means that selectively engages with the section, so there is no need to adjust the feed amount. The operation of the sewing machine is simplified, even beginners can easily use the sewing machine, and a seam pattern with a good appearance can always be formed.

A person skilled in the operation of a sewing machine can move the manual operation member from the predetermined position to within the corresponding normal operation range against the action of the holding means as necessary. The control cam is rotated so that the cam follower engages with the feed adjustment cam surface existing within an angular range apart from the angular position where the cam portion exists, and the feed amount is adjusted numerically as in the conventional sewing machine. ``and the manual operation member body is locked in its moving operation position by the action of the locking means against the action of the holding means, A stitch pattern can be formed with an appropriate feed amount,
It is extremely practical and does not feel lacking. Furthermore, when the cam selection means is operated to form another stitch pattern, the action of the locking means is normally released, and the manual operation body, which was locked at the moving position, is moved to the holding means. As a result of the action, the manual operation body is returned to the predetermined position and the optimal feed amount for the newly selected stitch pattern is automatically set, so the manual operation body is returned to the predetermined position each time a stitch pattern is selected. To provide a zigzag sewing machine which has excellent practical effects such as no need for adjustment of the feed amount and no troublesome adjustment of the feed amount.

[Brief explanation of drawings]

The drawings are illustrative of embodiments embodying the present invention.
The figure is a front view of the main parts with the sewing machine frame removed, Figure 2 is a sectional view taken along the Rollo line in Figure 1, Figure 3 is a sectional view taken along the plate-m line in Figure 1, and Figure 4 is a sectional view of Figure 2. W-W cross-sectional view, Figure 5 is the second
``Figure 6 is a front view of the manual knob, and Figure 7 is a developed view for explaining the cam surface of the operating cam body.''
FIG. 8 is a diagram viewed from the leg-to-leg line of FIG. 3 to explain the shape of the feed control cam; FIG. 9 is a diagram to explain the settings of the amplitude and feed amount for a selected stitch pattern. In the figure, 1 is the main shaft of the sewing machine, 3 is a cam shaft, 4 is a pattern cam, 8 to 12 are feed control cams, 8a to 12a are cam parts, 8b to 12b are feed adjustment cam surfaces. First and second swing frames, 16 and 17 are first and second cam followers, 21 is an operating shaft, 22 is a selection knob, 23 is a first selection cam, 24 is a second selection cam, 25 is the release cam,
26 is a lift cam, 27 is a first moving lever, 31 is a second moving lever, 35 is a release lever, 61 is a manual knob, 62 is an operating cam body, 63 is a locking disc, 64 is a coil spring, 65 is a regulation pin, 66 is an operating arm, 67 is a rod, 6
8 is a connecting plate, 74 is a rod L, 73 is an intermediate lever, 77
76 is a link arm, 76 is a feed adjustment shaft, 96 is a stop arm, 98 is a compression spring, and 99 is a release arm. Figure 1 Figure 4 Figure 7 Figure 2 Figure 3 Figure 5 Figure 6 Figure 9

Claims (1)

[Claims] 1. A plurality of pattern cams that are arranged in parallel on one axis and are rotationally driven in conjunction with the main shaft of the sewing machine for the lateral oscillating movement of the needle, and that selectively engage the pattern cams. a first cam following means for applying a lateral rocking motion to the needle according to the shape of the cam; and a feed adjustment cam arranged in parallel on the axis of the pattern cam or on an axis parallel to the axis. a plurality of feed control cams having a surface and rotatable independently of rotation of the main shaft; and a feed adjuster for adjusting the feed movement of the feed dog and selectively controlling the feed control cam. a second cam following means that engages with the sewing machine frame; and a manual operating section operatively connected to the feed control cam for rotating the feed control cam by operation from outside the sewing machine frame to operate the feed adjuster. cam selection manually operable from outside the sewing machine frame for engaging said first and second cam follower means with cams corresponding to a desired stitch pattern in said pattern cam and feed control cam, respectively; a zigzag sewing machine comprising a spring means, the zigzag sewing machine having a spring means for setting the feed adjuster arbitrarily within a feed amount adjustment range from 0 to a maximum feed amount by operation of the manual operation member body; A holding means is provided for urging the manual operation body toward a predetermined position and always holding the manual operation body at the predetermined position, and the second cam following means is provided at the predetermined position of the manual operation body. Provided at the same angular position of the plurality of feed control cams that can be engaged are each provided with a cam portion for setting a feed amount and feed direction that are determined to be optimal for forming the stitch pattern, and the manual operation portion. A locking means is provided for locking the manual operation member body at the moving position when the body is moved within a normal operation range apart from the predetermined position against the action of the holding means. , the feed amount is set to 0 within the same angular range of the plurality of feed control cams that can be engaged by the second cam follower within the operation range of the manual operation body.
and an adjusting cam surface for arbitrarily adjusting the cam selection means within a maximum adjustment range; A coupling means is provided for operatively coupling the cam to the locking means, and when the cam selection means is operated to select a desired stitch pattern, the manual operation body is always located at the predetermined position. The feed amount and feed direction are automatically set according to the selected stitch pattern, and if necessary, by operating the manual operating body within the normal operating range, the automatically set feed amount and feed direction are automatically set. An automatic feed setting device characterized in that the feed amount can be changed arbitrarily.