JPS5932494A - Stitch pattern selector of sewing machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a device for selecting a sewing pattern for a sewing machine.

Conventionally, when selecting a sewing pattern on a sewing machine using a pattern cam, a number of followers corresponding to the number of cams are compared, and a □ follower that is twisted in association with the operation of the operating member is used as one of the laminated cams. one in which a desired □ sewing pattern □ is obtained by engaging the two;
Some machines have one follower and move the follower to select one of the laminated cams to obtain a desired sewing pattern. The former requires a follower mechanism equal to the number of cams, and the latter requires a moving member to move the follower and a release member to release the follower from the cam. A release cam □, a moving cam, and a supporting member □ to support the follower □ and transmit the complementary movement of the follower to the needle bar are required. Therefore, there are disadvantages such as a complicated structure, a tendency to break down, and a tendency to cause gaps between parts connections.

□The present invention i In view of the above drawbacks, the structure has been fundamentally changed.
-IヮL7'c=l,. Aah, eh*s m,
o"m"'m Summer is ■One of the laminated cams is moved in the axial direction using one follower for swing width and one feed table without using a release cam or a moving cam. It is an object of the present invention to provide a novel sewing pattern selection device for a sewing machine, which selects a sewing pattern to obtain a desired sewing pattern.

One embodiment of the present invention will be described below with reference to the drawings.
As shown in Fig. 2, a main shaft 2 is rotatably supported in a sewing machine frame 1, and as the main shaft 2 rotates, a needle bar (not shown) provided at the head of the sewing machine frame 1 moves up and down. Exercise is now given. A worm 3 is fixed to the main shaft 2, a mechanism stand 4 is fixed in the upright part of the sewing machine frame 1 in proximity to the worm 3, and the lower end of the mechanism stand 4 is attached to the shaft in the bed part of the sewing machine frame 1. It hangs down near the lower shaft 6 which is supported and rotated synchronously with the main shaft 2 by the timing belt 5. The upper and lower ends of the mechanism table 4 have bent portions 4a facing parallel to each other,
4b, and a cam shaft 7 is provided at the ends of the bent portions 4a, 4b.
is penetrated in the vertical direction, and is rotatably supported without play in the axial direction by the retaining ring 8, the seat plate 9, 10, and the worm gear 1 fixed to the upper end. The worm gear 11 meshes with the worm 3, and as the main shaft 2 rotates, the camshaft 7 is rotated at a reduced speed. A flat portion 7a is provided along the axial direction on the road side portion of the camshaft 7, and a laminated cam 12 is inserted into the camshaft 7, and a flat plate is inserted into the rectangular groove 12h provided in the hole at the upper end of the laminated cam 12. J3 is inserted and brought into contact with the flat portion 7a, and the laminated cam 12 is mounted so that it can move in the axial direction of the camshaft 7 and rotates as one with the rotation of the camshaft 7 ( (See Figures 3 and 7). The laminated cam 12 has an amplitude pattern cam part 12b on the upper part that controls the amplitude.
and an automatic feed cam section 12c at the bottom for controlling the cloth feed, and the swing width pattern cam section 12b has a number of single cams 12b-1, 12b-2, . n
The automatic feed cam section 12c has a single 12 cm cam for the number of sewing patterns in which the feed is automatic.
It is composed of 1.12cm2, . . . , 12cm (see Fig. 8). A support frame 14 in the shape of an opening is loosely fitted onto the camshaft 7, and a laminated cam 12 is supported between the upper end piece 14a and the lower end piece 14b. A rack 15 is provided along the axial direction. On the other hand, an L-shaped bent part 4c is formed on the side surface of the mechanism base 4, and a shaft 17 with a pattern selection dial 16 fixed to one end is supported by a collar 18 so as to be rotatable in the axial direction without play. has been done. A positioning cam 19, which is integrally formed with a gear 19a that meshes with the rack 15, an outer cam 19b, and a protrusion 19c, is supported on the shaft 17.
is inserted so that the positioning cam 19 rotates together with the pattern selection dial 16. Further, as shown in FIG. 3, a pin 20 is implanted adjacent to the support portion of the shaft 17 of the bent portion 4C, and a protrusion 19d that engages with the pin 20 is provided protruding from the side surface of the gear 19a. The rotation range of the pattern selection dial 16 is regulated. On the other hand, as shown in FIG. 2, the outer periphery of the outer cam 19b has a number of recesses 19 equal to the number of sewing patterns.
e is formed, and the tip of the positioning spring 21 with one end fixed to the bent portion 4C (5) is inserted into the recess 1.
9e to position and maintain the rotation angle of the positioning cam 19 at the desired sewing pattern selection position.

A rising portion 4e is provided approximately at the center of the connecting portion 4d that connects the bent portions 4a and 4b of the mechanism base 4, and the shaft 22 is connected to the cam shaft 7 between the rising portion 4e and the bent portion 4a. The shafts are supported in parallel and stopped with retaining rings 23 and 24.

An amplitude cam follower 25 and a spring 26 are fitted to the shaft 22, and the spring 26 causes a spherical portion 25e (described later) of the lower end of the amplitude cam follower 25 to move to the amplitude pattern cam portion 12 of the laminated cam J2.
The one-stroke width cam follower 25, which is urged to come into pressure contact with b, has a U-shape, and has a pin 2 at its upper tip 25a.
7 is implanted, and a needle bar pull bar 29 is pivotally connected to the bin 27 by a retaining ring 28, and the needle bar pull bar 29 is connected to a known needle bar swinging mechanism (not shown). The lower end portion 25b has a downwardly bent hanging portion 25e (see Fig. 3).
, the lower end of the hanging portion 25c protrudes in the direction of the laminated cam lj,
A slope (6
) part 25d and its tip spherical part 25e (see FIG. 6). On the other hand, the amplitude pattern cam portion 1 of the laminated cam 12
21) single cams 12b-1, 12b-2,..., 1
2b-n has a cam lift corresponding to each sewing pattern, and each single cam 12b-1, 12b-2, . . .
Between 12b and 12n is a cylindrical portion 12d having the same diameter as the minimum radius of the cam lift. Therefore, when the laminated cam 12 is moved upward or downward, the follower 25, which was in pressure contact with a certain single cam, moves from the spherical part 25e to the inclined part 25d (see FIG. 6), and the end of the single cam moves. The spherical portion 25e is pushed up and comes into pressure contact with the next single cam. Further, due to the rotation of the laminated cam 12, the follower 25 moves to the spherical portion 25.
The needle is oscillated about the shaft 22 via the needle e, and the needle bar pull bar 29 is driven to cause the needle to oscillate.

In FIGS. 3 and 5, 30 is a feed dial that can be operated from outside the sewing machine frame 1, and is fixed to a shaft 31 supported on an L half-bent portion 4C bent near the center of the mechanism base 4. The teeth 32a of the feed adjustment cam 32 and the feed 9 dial 30
The teeth formed inside engage with each other, allowing the two to rotate together. The axial torque of the feed adjustment cam 32 is maintained by a spring washer 33 and a retaining ring 34, and a grooved cam having a left wall 32b and a right wall 32c in a V-shape is formed in the center. A shaft 35 is located below the feed adjustment cam 32.
The feed adjustment cam 32 is attached to the small-shaped bent portion 4f of the mechanism base 4.
A feed lever 37 is supported on the shaft 35 in a direction perpendicular to the feed lever 37, and the shaft 35 includes a feed lever 37 having a pin 36 inserted into the groove of the feed adjustment cam 32 at its tip, and an eccentric pin 38 implanted in the feed lever 37. A feed adjustment lever 40 which is adjusted and fixed to the feed lever 37 by a screw 39 is pivotally supported.

On the other hand, as shown in FIGS. 1 and 5, a feed 9 adjustment link shaft 41 is pivotally supported in the top and bottom portions of the sewing machine frame 1, and the feed adjustment link shaft 41 has its rotation angle and rotation direction. It is connected to a known feeding mechanism (not shown) which can change the amount of feeding and forward/backward movement by means of the following. A feed adjustment link 42 is fixed to the end of the feed adjustment link shaft 41, and a bottle 43 is installed at the tip of the feed adjustment link 42, and a small hole 42a is provided in the 90' direction of the bottle position. A spring 45 is stretched between the small hole 42a and a stopper 44 fixed to the sewing machine frame 1, and the feed adjustment link 42 is biased to bring the bin 43 into contact with the hanging piece 37a of the feed lever 37, and the spring The tension adjusting cam 32 moves the bin 36 of the feeding shillper 37 by the tensile force of 45.
The grooved cam right wall 32c is in pressure contact with the grooved cam right wall 32c (see FIG. 5). Therefore, as the feed dial 30 rotates, the rotational position of the feed shimper 37 moves due to changes in the groove cam right wall 32c of the feed adjustment cam 32, which rotate together, and the hanging piece 37a
The inclination angle of the feed adjustment link 42 changes via the feed adjustment link 42, and the feed adjustment link shaft 4 rotates, thereby obtaining the desired feed amount.

In addition, as shown in FIGS. 1 and 2, the bending portion 4 of the mechanism base 4
A shaft 46 is installed in parallel to the camshaft 7 in b, and the shaft 46
A feeding cam follower 48, which is prevented from being removed in the axial direction by a retaining ring 47, is pivotally supported on the feeding cam follower 4.
8 has one end bent upward to form the amplitude cam follower 2.
A spherical part 48a similar to 5 and inclined parts 48b are formed on both sides of the spherical part 48a (9). The other end of the feeding cam follower 48 is similarly bent upward to form a flat portion 48c and a hanging piece 48d at the tip thereof.
A spring 5o having a tensile force sufficiently weaker than the tensile force of the spring 45 is tensioned between the bottle 49 installed at the lower part of the connecting part 4d of the mechanism base 4 and the hanging piece 48d, and the end surface of the flat part 48c is is engaged with the extension piece 40a of the feed adjustment lever 40 (
(See Figure 4). On the other hand, the feed automatic cam portion 1 of the laminated cam 12
2c also has a plurality of single cams 12cm 1.12cm2, . . . , 12cm, similar to the swing width pattern cam portion 12b.

and a cylindrical portion 12d between them, and when the laminated cam 12 is in the lower part, the feeding cam follower 48 is in pressure contact with the cam,
As the laminated cam 120 rotates, the follower 48 swings around the shaft 46 in accordance with the cam lift, and the feed adjustment link shaft 41 is rotated via the feed adjustment lever 40 and the feed lever 37 to control the feed amount. do. In this embodiment, as shown in FIG. 7, the sewing pattern is straight line A1 single pattern B1 super pattern c
The laminated cams 12 have single cams 12b-1, . . . , 12b-n, 12cm1, (1
0)..., 12cm are arranged. For the straight line A and the single pattern B, the feed amount is manually variable and reeds. In this case, the laminated cam 12 is located at the upper part where the feed cam follower 48 does not contact, and the feed amount is determined by operating the feed dial 30. .

In the Sue-G pattern C, the feed amount is automatically set in correspondence with the vibration width, and at this time, the laminated cam 12 is located at the bottom, and the feeding cam follower 48 is also pressed against the laminated cam 12. .

On the other hand, as shown in FIG. 2, below the feed dial 3θ, a backward button 5 which is operated from the outside is pivotally supported on the sewing machine frame 1, and the lower end of the backward button 51 is connected to the other side of the feed releper 37. Two hanging pieces,? 7 Opposite b, backward button 51
By pushing the bottom end of the piece down,? 7b and rotates the 1st feed tray q-37, the feed adjustment cam 32
The groove 36 that was in contact with the right wall 32c of the groove cam is moved to the left wall 32.
b, so that the same amount of backward stitching as forward stitching can be obtained.

The present invention does not consist of the above-mentioned configuration, and its operation will now be explained. When the pattern selection dial 16 is rotated, the support frame 14 is moved through the gear 19a1 rack 15 of the positioning cam 19.
moves downward with the laminated cam 12. In the illustrated example, the pattern selection dial 16 is positioned by the protrusion 19d of the cam 19.
When the bin 20 is rotated counterclockwise to the position where it comes into contact with the bottle 20, the laminated cam 12 is located at the uppermost position, and at that time, the spherical part 25e of the amplitude cam follower 250 is pressed against the linear cam (cylindrical part 12d) of the laminated cam 12. Then, straight stitching is performed.

Now, when the pattern selection dial 16 is rotated clockwise, the laminated cam 12 is lowered, and the follower 25 is pushed up by the end of the adjacent single cam and the appropriate pressure angle of the inclined part 25d of the follower 25, and the spherical part 25e is successively moved to the adjacent part. press against a single cam. Then select the desired pattern and start the sewing machine.
The laminated cam 12 is rotationally driven by the main shaft 2, and the movement corresponding to the cam lift of the selected single cam is transmitted to the needle via the needle bar pull bar 29.

On the other hand, the amount of cloth feed can be determined by rotating the feed dial 30 in straight line A and single pattern B. The feed adjustment link 42 is adjusted by changing the rotational position of the feed sillper 37 that abuts the feed lever 32c and tilting the feed adjustment link 42. Further, when the pattern selection dial 16 is rotated clockwise and the laminated cam 12 is lowered to the vicinity of the lower end, the feeding cam follower 48 moves to the automatic feeding cam section 1 of the laminated cam 12.
2 -□ -Pattern C, which is in pressure contact with 2c and has an automatic feeding pattern
is selected. At this time, the oscillation width cam follower 25 also comes into pressure contact with the single cam corresponding to the Sue-G pattern of the oscillation pattern cam portion 12b of the laminated cam 12. When the stitch width is adjusted to the maximum cloth feed position and the sewing machine is driven, the feed cam follower 48 controls the feed amount in addition to the stitch width amount controlled by the stitch width cam follower 25. C is sewn.

The present invention has the above-mentioned structure and operation, and has one follower for vibration amplitude and one for feed, and can be moved from a straight line by simply moving the laminated cam in the axial direction using a selection device. This is an epoch-making invention that allows you to select up to the Sue-G pattern in which the feed 9 is automatically switched, and unlike the conventional (13), it has a support member that supports each follower and a release member that releases the follower from the cam. Also, since the release cam and moving cam related to these are not used, the number of parts for the same function is greatly reduced, it is not bulky that can contribute to cost reduction, and there are few failures, and the effect is excellent. Furthermore, in the present invention, all the sewing patterns are selected while the laminated cam moves from one end to the other, so it is possible to display the selected patterns in relation to the movement of the laminated cam. By extending the part and attaching colored paper or directly attaching an electron tube, etc., a selected pattern can be displayed, and one part can have multiple functions, so the benefits are remarkable. There is.

[Brief explanation of drawings]

FIG. 1 is a front view of the main part of an embodiment of the present invention, FIG. 2 is a side view of the main part, FIG. 3 is a side view of the main part with the laminated cam located at the lowest end, and FIG. Figure 2 A parent diagram, 5th
The figure is a side view of the main part showing the feed adjustment part, Figure 6 is an enlarged explanatory view of the laminated cam and follower part, Figure 7 is a plan view of the laminated cam part, and Figure 8 is (IA) Laminated cam and sewing It is an explanatory diagram of a pattern.

Claims (1)

[Claims] A camshaft that rotates at a reduced speed in conjunction with the main shaft of the sewing machine, a laminated cam that is inserted into the camshaft, rotates as a layer with the camshaft, and is movable in the axial direction; The selected number position is operatively connected to the needle bar swinging mechanism, and is engaged with one of the single cams in the amplitude pattern cam portion of the laminated cam □ to respond to the cam rotation. and then insert the needle □
A cam follower for 9-width vibration and a feed mechanism that works □
□Continue: The laminated cam feed automatic cam part':1
Providing a sloped portion having a direction that engages with one of the single bushings R and lands on the six-piece lift to change the bending direction, and positioning the end lip on the moving path of the laminated cam. □ A sewing pattern selection device for a sewing machine, characterized in that the cam surface of the laminated cam is brought into pressure contact Δ. □