JPS6022922Y2 - Sewing pattern selection mechanism of sewing machine - Google Patents

Description

[Detailed description of the invention] The present invention relates to a sewing pattern selection mechanism of a sewing machine, in which a straight stitch and a plurality of zigzag pattern stitches are selected by one pattern selection dial that can be rotated one or more revolutions.
In the first rotation, a straight line and zigzag pattern with a constant cloth feed amount is selected, and in the second rotation, a super pattern sewing in which the cloth feed amount changes in a specific cycle is obtained with respect to the straight line and zigzag pattern selected in the first rotation. To provide a sewing pattern selection mechanism in which a variety of different super pattern stitches can be obtained by operating a width dial at the second rotation of the pattern selection dial in a sewing machine equipped with the above.

Embodiments of the present invention will be described below with reference to the drawings. Reference numeral 1 denotes a main shaft pivotally mounted on a sewing machine frame 2, and 3 a main shaft that is perpendicular to the main shaft and fitted onto a support shaft 4 fixed to the sewing machine frame 2. The worm 5 is engaged with the worm 5 fixed to the main shaft, and the
A worm wheel that rotates at a reduced speed (one-sixth in the case of this embodiment), and 7°8 is a pattern cam group for varying the needle bar amplitude that is integrally formed with the worm wheel. a, 7b... and feed variable cam group 8a, 8b* 9 is a selection dial shaft pivotally mounted on the sewing machine frame 2 parallel to the support shaft 4, 10
is a pattern selection dial fixed to the end of the selection dial shaft 9 protruding outward from the sewing machine frame 2, and the dial is fixed to the sewing machine frame 2 and has a plurality of notches 11a formed around it. The plate 11 is set to be able to rotate moderately by the cooperation of the moderation pin 12 housed in the pattern selection dial 10 and engaged with the notch 11a, and the moderation spring 13 that presses the pin.

Further, the pattern selection dial 10 is set so that it can rotate more than once, and in this embodiment, twice.

Reference numerals 14 and 15 denote a cylindrical pattern cam selection body and a disc-shaped feed setting cam body fixed to the selection dial shaft 9 protruding inward from the sewing machine frame 2. A pattern selection cam 1 comprising a winding drum 16 for winding the edge 68, a side cam surface 17a displaceable in the axial direction and a cylindrical cam surface 17b displaceable in the radial direction on the rear surface.
7 are formed respectively.

Further, a super selection cam 18 formed of a spiral groove is formed on the front surface of the feed setting cam body 15, and a feed cam 19 provided with a radially displaceable cam surface is formed on the rear surface.

Reference numeral 20 denotes a disc-shaped amplitude control cam body 2 which is pivotally mounted on the front surface of the winding drum 16 of the pattern cam selection body 14 via a seat plate 21.
0a is an amplitude control cam surface formed on the circumferential surface of the cam body.

Here, the shape of the super selection cam 18 will be described in detail.The super selection plate 31 (described later) engages with the super selection cam 18 in the range of the first rotation of the pattern selection dial 10.
A small radius cam surface 18a of equal diameter is formed to hold the switching pin 32 of the super switching plate 31 at the uppermost position, and to hold the switching pin 32 of the super switching plate 31 at the lowermost position in the range of the second rotation. A large radius cam surface 18b of equal diameter is formed to communicate with the small radius cam surface 18a.

22 is pivotally attached to the sewing machine frame 2 so as to be able to swing from side to side.
The needle bar support 24 supports the needle bar 23 that slides vertically on the side surface 22b, and one end of the needle bar support 24 is pivoted to the needle bar support 22 by a pivot pin 25 disposed on the extension line of the axis of the needle bar 23. A needle bar swinging arm 26 is attached to the base end 2 and has a follower 24a formed at the other end to engage any cam of the pattern cam group 7.
6a is a selection adjustment arm fixed to the rear surface of the needle bar swinging arm 24 and having a follower 27 implanted at its tip that engages with the pattern selection cam 17. ) is biased so as to press into contact with the pattern selection cam 17.

Reference numeral 28 denotes an amplitude adjustment arm whose base end 28a is fixed to the front surface of the needle bar swinging arm 24, and whose tip is implanted with a follower 29 that engages with the cam surface 20a of the amplitude control cam body 20. The child 29 is biased by the action of a suitably provided spring (not shown) so as to press into contact with the amplitude control cam surface 20a.

30 is a U-shaped super selection arm that is fitted onto the support shaft 4 and accommodates the pattern cam group 7 and the feed variable cam group 8 inside;
A protruding cam 30a that can be displaced in the radial direction and a switching piece 30b consisting of mutually stepped support surfaces 30c and 30d are formed on the rear end surface of the iron arm.

30e is a slope that connects the support surfaces 30C and 30d, and in this embodiment, the support surface 30c is connected to the support surface 30c.
0d is arranged at a lower position.

Reference numeral 31 denotes a super switching plate which is fitted to the support shaft 4 protruding from the rear end surface of the super selection arm 30 so as to be restricted from moving in the axial direction, and a switching pin 3 is implanted at the left end of the plate facing rearward.
2 is engaged with the super selection cam 18 of the feed setting cam body 15.

33 is a feed variable arm whose U-shaped base end 33a is pivotally attached to a pivot 31a which is implanted in the upper part of the super switching plate 31 facing forward, and 33b is formed into an iron arm. The protruding cam 30a of the super selection arm 30 with the follower
It is set so that it can be engaged with.

34 is housed inside the base end 33a of the feed variable arm 33, is fitted onto a shaft 36 fixed above the base end by a retaining ring 35, and is pressed rearward by a compression spring 37 with a weak spring pressure. The protruding piece 34a formed at the lower end of the super feed pawl is set so as to be able to engage with the support surface 30b or 30c of the super selection arm 30, and the follower 34b can be engaged with the feed variable cam group 8, respectively.

Reference numeral 38 denotes a width adjustment plate on which a width dial shaft 39 is installed, which is perpendicular to the main shaft 1 and pivotally mounted on the sewing machine frame 2; 40 is an end of the width dial shaft 39 that projects outward from the sewing machine frame 2; A swing width dial is fixed to the sewing machine frame 2, and the switching plate 42 has a plurality of notches 42a formed around the periphery of the dial.
and a moderation pin 43 that is accommodated in the swing width tile 40 and engages with the notch 42a of the switching plate 42, and a moderation spring 44 that presses the pin so as to be able to rotate moderately. ing.

45 is a swing width display section displayed on the front side of the swing width dial 40.

46 has one end pivotally attached to a pin 47 implanted in the front surface of the amplitude control cam body 20 with its axial movement restricted by a retaining ring 48, and the other end implanted in the lower end of the amplitude adjustment plate 38. This is a swinging rod pivotally attached to a pin 49.

50 has one end pivotally attached to a pin 51 implanted in the front end surface of the super selection arm 30 so as to restrict axial movement, and the other end overlaps the swing rod 46 and is connected to the pin 49 by a retaining ring 52. This is a switching rod that is pivotally mounted with limited directional movement.

53 is a feed adjuster rotatable around a feed adjuster shaft 54 parallel to the main shaft 1; 55 is a feed adjustment pin implanted at the rear end of the feed adjuster; 56 is a connection between the pin and the sewing machine frame 2; a relatively strong adjuster spring mounted between the feed adjuster 53 and biasing the feed adjuster 53 to rotate about the feed adjuster shaft 54 in a direction that produces a positive maximum feed (clockwise in FIG. 1); A feed variable rod 57 has an upper end fixed to a feed variable shaft 58 fitted to the other end of the feed variable arm 33 with a nut 59, and a lower end pivotally connected to the feed adjustment pin 55.

Reference numeral 60 denotes an adjuster rotating plate fitted on the feed adjuster shaft 54 adjacent to the feed adjuster 53, and an abutment screw 62 fixed by a nut 61 to a bent piece 60a formed on the upper part thereof is shown in FIG. It is set so that it can abut against the feed adjuster 53 by a weak spring (not shown), so that the adjuster rotating plate 6
0 can rotate integrally with the feed adjuster 53.

Reference numeral 63 denotes a feed setting rod that connects the feed setting arm 64 that engages with the feed cam 19 and the adjuster rotating plate 60, but its detailed explanation will be omitted since it is not relevant to the present invention.

Reference numeral 65 indicates sewing patterns selected by rotating the pattern selection dial 10 in figures 66.66a, 66b...
The pattern display board is fixed to the front of the sewing machine frame 2.

Reference numeral 67 denotes a selected pattern indicating needle which is moved in the left-right direction by an appropriate means, such as a string 68 whose one end is fixed to the outer periphery of the winding drum 16, to the position of the sewing pattern figure 66 corresponding to the rotational position of the pattern selection dial 10; Reference numeral 69 is a mark section displayed on the sewing machine frame 2 in correspondence with the swing width display section 45 of the swing width dial 40.

The present invention is constructed as described above, and its operation will be explained. In FIG. 5, the pattern selection dial 10 is in the range of the first rotation (the range indicated by 1■Y in FIG. 3), and the swing width dial 40 is The swing width display section 45 shows the state of each part in the range of rOyo to r5J.

In this state, the follower 24a of the needle bar swing arm 24 is engaged with the pattern cam group 7, and the follower 29 of the swing width adjusting arm 28 is engaged with the swing width control cam body 20, respectively.

Furthermore, since the switching pin 32 of the super switching plate 31 is engaged with the small radius cam surface 18a of the super selection cam 18, the switching pin 32 and the pivot 31a are at the uppermost position P1P2 as shown in FIG. Follower 34 of pawl 34
b is apart from the feed variable cam group 8.

Therefore, in the state shown in FIG. 5, the width of the zigzag pattern can be selected and set by rotating the width dial 40 in the range of 101 to r5J, and the width of the zigzag pattern can be selected and set by rotating the width dial 40 in the range of 101 to r5J, and the feed cam 19 can be used to adjust the width of the zigzag pattern to the selected pattern cam group 7. A constant cloth feed amount can be obtained.

FIG. 6 shows the state of each part when the pattern selection dial 10 is in the range of 11 yo and rM yo of the width display section 45 of the oscillation width dial 40 is matched with the mark section 69.

In this state, the follower 29 of the amplitude adjusting arm 28 is moved to the leftmost position by the amplitude control cam surface 20a of the amplitude control cam body 20, and the follower 24a of the needle bar swinging arm 24 is moved to the leftmost position. It moves to a position where it does not engage with the cam group 7.

Therefore, in the state shown in FIG. 6, the needle bar 23 has zero amplitude and can perform straight stitches at the center position.

FIG. 7 shows the state of each part in the range of the second rotation of the pattern selection dial 10 (the range indicated by 1■Y in FIG. 3). In this state, the follower 29 of the swing width adjustment arm 28 is As the follower 27 of the selection adjustment arm 26 that engages with the pattern selection cam 17 moves, the cam surface 20a of the amplitude control cam body 20
Move to a position where it does not engage.

Further, since the switching pin 32 of the super switching plate 31 is engaged with the large radius cam surface 18b of the super selection cam 18, the switching pin 32 and the pivot 31a are at the lowermost position P3P, as shown in FIGS. 9 and 10. There is a super feed claw 3
The fourth follower 34b comes to engage with the feed variable cam group 8.

Therefore, in the state shown in FIG. 7, it is possible to perform super pattern sewing in which the amount of cloth feed changes in a specific cycle.

In this case, when r5J of the swing width display section 45 of the swing width dial 40 is aligned with the target section 69 as shown in FIG. The projecting piece 34a of the waist super feed claw 34 moves to the position as shown in the figure through the compression spring 37, and comes into contact with the support surface 30c of the super selection arm 30.
The follower 34b of the super feed claw 34 is the feed variable force group 8.
The amount of cloth feeding is automatically set by lifting the cam 8a so as to engage the cam 8a in front of the cam 8a, and a super pattern seam allowance can be obtained.

Further, as shown in FIG. 10, when "MJ" of the swing width display section 45 of the swing width dial 40 is aligned with the mark section 69, the projection 34a of the super feed claw 34 is moved by the compression spring 37 to the support surface 30d of the super selection arm 30. The follower 34b of the super feed pawl 34 comes to engage with the cam 8b of the variable feed cam group 8, and a super pattern seam allowance is obtained.

At this time, it is necessary to set the feed adjuster 53 so that the feed amount of the super pattern can be obtained without cutting the feed amount of the super pattern.

Incidentally, when the feed variable cam group 8 is selected, the protruding cam 30a of the super selection arm 30 first engages the follower 33b of the feed variable arm 33.
This is for engaging the protruding cam 30a and temporarily separating the follower 34b of the super feed pawl 34 in the outer radial direction of the feed variable cam group 8.

As described above, according to the present invention, the selection positions of all the patterns to be selected are not distributed within one rotation of the pattern selection dial as in the past, but the dial can be rotated more than one rotation, and the first rotation of the dial In the eyes, only straight lines and various zigzag patterns with a constant cloth feed amount are selected, and in the second rotation, the first
In a sewing machine that can produce super pattern sewing in which the fabric feed amount is changed at a constant cycle for the sewing pattern selected in the second rotation, different sewing patterns can be created by rotating the width dial in the second rotation as well. This invention is extremely useful in practice, as it allows super pattern stitching to be obtained, and allows sewing many sewing patterns by simply operating the swing width dial.

[BRIEF DESCRIPTION OF THE DRAWINGS] The drawings show an embodiment of the present invention, in which Fig. 1 is a perspective view of related mechanisms in the sewing machine head, Fig. 2 is a front view of the main parts of Fig. 1, and Fig. 3 is a related explanatory diagram of a part of the mechanism shown in FIG. 2 and the pattern display device, FIG. 4 is an exploded perspective view of the related mechanism shown in FIG. 1, and FIGS. FIGS. 8 to 10 are longitudinal sectional views including the axial center of the selection dial shaft showing the relationship between the control body and various followers, and are explanatory diagrams of the operation of the related mechanisms. In the figure, 1 is the main shaft, 7 is a pattern cam group for changing the needle bar amplitude, 8 is a feed variation cam group, 10 is a pattern selection dial, 14 is a pattern cam selection body, 15 is a feed setting cam body, and 18 is the cam body , 23 is the needle bar, 30 is the super selection arm,
30b is a switching piece for the iron arm, 31 is a super switching plate, 34 is a super feed pawl, and 40 is a swing width dial.

Claims (1)

[Scope of utility model registration request] integrally formed with a pattern cam group 7 for needle bar swing width variation and a feed variation cam group 8 that rotate at a reduced speed by an integral number of rotations of the main shaft 1; and a pattern selection dial 10 that rotates one rotation or more. A pattern cam selection body 14 and a feed setting cam body 15 are provided which rotate to select the pattern cam group 7 and the feed variable cam group 8, respectively, and a super switching plate 31 that engages with the feed setting cam body 15 is provided. A super selection cam 18 is formed on the cam body such that the position on the radius differs between the first rotation and the second rotation of the pattern selection dial 10, and a super feed pawl 34 is pivotally attached to the super switching plate 31. does not engage with the feed variable cam group 8 in the range of the first rotation of the pattern selection dial 10, but engages with the feed variable cam group 8 in the range of the second rotation, and as the main shaft 1 rotates. In a sewing machine that oscillates and changes the amount of cloth feed in a specific cycle to achieve super pattern stitching, by rotating the swing width dial, which is rotatably supported, out of the normal width adjustment range. A super selection arm supported on a support shaft is rotated via a switching rod connected to the shaft of the width dial, and a switching piece consisting of a stepped support surface integrally formed with the super selection arm allows the above-mentioned The super feed pawl supported by the pivot of the super switching plate is moved in the axial direction of the pivot to engage the feed variable cam group, and the feed adjustment arm that swings integrally with the super feed pawl adjusts the cloth feed. A sewing pattern selection mechanism for a sewing machine, characterized in that it is connected to a feed adjuster for.