JPS603807Y2 - Cam selection device for zigzag sewing machine - Google Patents

Description

[Detailed description of the invention] This invention relates to a cam selection device for a zigzag stitch sewing machine, and in particular, it is possible to select a predetermined cam surface and sew a predetermined pattern by moving one or two of the three contacts at the same time. This invention relates to a cam selection device for a zigzag sewing machine.

Since modern sewing machines are equipped with a large number of devices due to diversification of functions, there has been a need to effectively use a limited narrow space.

In addition, since a large number of cams are provided for each function, the conventional cam selection device transmits the movement of each cam to the needle swing mechanism and cloth feeding mechanism using two independent contacts.
Due to variations in the processing accuracy of the cam, for example, if one of the functions, such as buttonhole stitching or super pattern stitching, is adjusted to be appropriate, the other function may become inappropriate, so it is necessary to adjust so that both functions are appropriate. I couldn't do it.

Moreover, this requires high processing precision for each cam body, resulting in lower productivity and higher costs.

This idea divides the conventional single contactor, for example, for controlling cloth feed, into two independent functions, making it possible to adjust each separately during assembly, and making the device more compact. purpose.

Examples of this invention will be described below with reference to the drawings.

The camshaft 1, which rotates at a reduced speed in conjunction with the main shaft, has two cam surfaces 2a and 2b at different positions along the axis of rotation for controlling the feed of the fabric for oversewing on the left and right edges of the buttonhole from the top of Fig. 1. The formed second cam body and a large number (six in the embodiment) of cam surfaces 3a to 3 for similarly controlling the swing width of the needle bar.
A first cam body formed with f and a third cam body formed with two cam surfaces 4a and 4b for controlling cloth feeding of the super pattern are provided so as to rotate together, and the first cam body Gaps 5 and 6 are provided between the third cam body 3 and the second cam body 2, and between the first cam body 3 and the third cam body 4, which correspond to the protrusion of the cam surface.

A regulator 10 having an arcuate groove 9 is swingably supported by a shaft 11 inside a U-shaped adjustment stand 8 supported on a machine frame by a shaft 7.

A free end of a contact 13 is disposed between the adjuster 10 and the first cam body 3 and is capable of swinging and moving in the axial direction about a shaft 12 fixedly arranged parallel to the shaft 11.

The base is supported on a shaft 14 fixedly arranged parallel to the shaft 12, and the arms 15a and 15b are connected to the contact 13 so as to allow its swing, and are movable together with the oscillating contact 13 in the axial direction. Pinch the pin 15c of the mover 15
It fits loosely into a groove cam 18 provided on the back surface of a selection cam 17 that is interlocked with the selection cam 17.

The bases of a second contact 19 and a third contact 20 formed in a U-shape are loosely fitted into the small diameter parts 7b and 7C on both sides of the large diameter part 7a of the shaft 7, and their free ends are always Both liquid contactors 19 and 20 are locked in positions facing the gaps 5 and 6.
A coil spring 21 is passed between them, and a surface contactor 19.
20 has an elastic body 22 whose free end is directed away from the camshaft 1.
．． 23 elastic force is applied.

Arc-shaped elongated holes 19a, 19b, and 2 are formed at the base of the contactor 19.20 so as to be aligned in the axial direction with the axis 7 as the center.
0at20b is a two-pronged link that has a roller 24 on one arm 25a that is always in pressure contact with a cam surface formed on the front part of the outer periphery of the selection cam 17 by the action of a coil spring 31, and is swingable around a shaft portion 25t). 25's other arm 25C and long hole 2
6 and a shaft 27 that loosely fits therein, and when the actuating body 28 moves upward, the second contact 19 moves upward against the coil spring 21. A ring-shaped engaging body 29, 30 is attached to the actuating body 28 so that when the actuating body 28 moves downward, the third contact 20 follows and moves downward against the coil spring 21. to be fixed.

At both ends of a horizontal shaft 32 rotatably supported on the machine frame, one end is connected to an appropriate well-known cloth feed conversion mechanism.
Due to the acting force of the elastic body 33, the other end 34a moves the selection cam 1
A swing link 34 that presses against a cam surface formed at the rear of the outer periphery of the arm 7 is fixed, and an arm 35 is fixed to the other end.

The interlocking body 36, which has flat surfaces 36a and 36b spaced apart from each other in the vertical direction and is swingable about a shaft 37 with respect to the machine frame, is arranged with one end abutting the free end of the arm 35 and can reciprocate along a horizontal straight line. The reciprocating plate 37 is connected to the reciprocating plate 37 by a stepped screw 38, and pins 19C provided on the second contact 19 and the third contact 20 are connected to the flat surfaces 36a and 36b. Adjustment plates 39 and 40 that engage with 20C are fixed with screws 41 and 42, and further the adjustment plates 3
9.40 is the eccentric shaft 4 supported on the plane 36at36b.
3.44, it is configured to swing slightly around shafts 45 and 46.

A needle bar swing arm 49 whose one end is connected to a well-known needle bar swing table via a link 47 and is swingable about a shaft 48 has a free end loosely fitted into the groove 9 of the adjuster 10 at the other end. Needle swing rod 5
0 are connected to each other by a step screw 51, and configured to swing in conjunction with the adjuster 10, and the direction in which the free end of the needle oscillating rod 50 moves away from the adjuster 10 in relation to the operation of the selection cam 17. The pull-up contact 53, which is always in contact with the cam surface formed at the center of the outer circumference of the selection cam 17 and swings around the shaft 52 by the acting force of the elastic body 59, and the elongated hole 5
4 and a bent portion 57 of a pull-up rod 56 connected via a shaft 55 loosely fitted therein are arranged opposite to a shaft 58 vertically disposed on the upper surface of the needle bar swing arm 49.

One arm 60a is connected to the needle swing rod 50 via a long hole 61 and a shaft 62 that loosely fits therein, and the intermediate portion is connected to the shaft 4.
Although not shown, the swing width limiting lever 60, which is loosely fitted in the needle swing width changing operation body and can freely swing against or against the elastic body 63, has a shaft 64 on the lower surface of the other arm 60b. is vertically disposed, and the needle swing release plate 68 pulls up one end of the rod 56.
and the other end is connected to the first contactor 13 via a coil spring 69.
Connect with.

The elastic force of the elastic body 70 is applied to the link 47 so as to rotate the needle bar swing arm 49 clockwise in FIG.

Since this device has the above configuration, when the sewing machine is driven from the state shown in FIGS. 1 and 2, the needle swing contact 13 swings around the shaft 12 following the change in the cam surface 3C of the first cam body. Since the adjuster 10 is oscillated, the needle bar oscillating arm 49 oscillates about the shaft 48 via the needle oscillating rod 50, which causes the needle bar to oscillate in a direction perpendicular to the fabric feeding direction, thereby creating a zigzag pattern. At the same time as the seam is formed, the swing width limiting lever 60 is pressed against the elastic body 63.
oscillating rod 50 against the regulator if moved against the
Since the engagement position of is away from the shaft 11, the swing of the needle increases, and when the needle is moved in the opposite direction, the swing of the needle decreases.

When the knob 16 is rotated counterclockwise from this state, the cam surface of the selection cam 17 changes, and the needle swing rod 50 is moved to the elastic body 70 via the lifting contact 53 and the lifting rod 56, and the needle bar swinging arm 49. At the same time as the release plate 68 moves in a direction away from the regulator 10 against The mover 15 moves away from the cam surface 3c in the radial direction and then follows the change in the cam groove of the selection cam 17 and moves the shaft 14 downward by a distance corresponding to the -cam surface protrusion. faces the cam surface 3d.

At the same time, the pull-up rod 56 returns to the left in FIG. It engages with surface 3d.

Note that while the first contact 13 is being changed between the cam surfaces 3c and 3d, the other second contact 19 and third contact 20 are maintained in the state shown in FIGS. 2 and 3.

When the knob 16 is rotated by one step clockwise from this illustrated state, the first contact 13 rises and engages the cam surface 3b due to the same action as described above, and the selection cam 1
The swing link 34 moves in accordance with the change in the cam surface of 7, thereby rotating the arm 35 clockwise around the shaft 32, and enabling the interlocking body 36 to swing counterclockwise. The second contact 19 and the third contact 20 are coil springs 22 and 23
The selection cam 17 rotates clockwise and moves outward from the gaps 5 and 6 beyond the maximum radius of the cam surface 2b.
Since the two-pronged link 25 rotates counterclockwise following the change in the cam groove and pushes the actuating body 28 upward, the engaging body 2
Only one second contact 19 is connected to the coil spring 21 via the coil spring 9.
Since the second contact 19 moves upward by a distance corresponding to the -cam surface elevation, the second contact 19 faces the cam 2b.

At the same time, the swing link 34 returns to its original position due to the action of the elastic body 33, so that the second contactor 19 engages with the cam surface 2b.

When the second contactor 19 is swung, the direction and pitch of cloth feeding in buttonhole overlocking are controlled via the swiveling link 34.

Thereafter, when the first contact 13 is moved to a position facing the cam surface 3a of the first cam body by the same action, the second contact 19 engages with the cam surface 2a of the second cam body, and the first contact If the child 13 is moved from the state where it is engaged with the cam surface 3d of the first cam body to the position where it faces the cam surfaces 3e and 3f, the actuating body 28 will move downward from the state shown in FIGS. 2 and 3. The third contact 20 is pushed down through the engaging body 30 against the coil spring 21 and engages with the cam surfaces 4a and 4b of the third cam body.

When the third contactor 20 is swung, the direction and pitch of cloth feeding in super pattern stitching are controlled via the swiveling link 34.

In addition, in Fig. 2, loosen the screws 41 and 42 and attach the eccentric shaft 4.
By rotating 3.44, the adjustment plates 39 and 40 will move to the shafts 45 and 46.
The second cam bodies 2a, 2b and the third cam bodies 4a, 4b rotate around the center and change their relative positions with respect to the interlocking body 36.
It is possible to correct the phase error of the second contact 19 and the third contact 20 with respect to each other separately.

As described above, this invention uses the two second and third contacts, which are always locked in positions facing the gaps between the respective cam bodies, to operate the operating means when the first contact is within a specific movement range. Since it is constructed so that each side moves separately against the elastic body in connection with operation, the space for movement of the contacts is smaller than in a case where these elements are constantly linked, and more devices and cams can be installed in a narrow space. Can be built-in.

In addition, since the cam body movement for each function, such as cloth feed for buttonhole stitching or cloth feed for super pattern stitching, is transmitted to the corresponding device using a plurality of independent contacts, the cam body Even if there are variations in processing accuracy or assembly errors, by changing the assembly position of the contact for each device, it is possible to adjust both functions to be appropriate, resulting in excellent practical effects. can get.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the main parts related to the swing of the needle bar with a part omitted, Fig. 2 is a perspective view of the main parts related to cloth feeding with a part omitted, and Fig. 3 is a part cut vertically. FIG. 4 is a plan view of FIG. 1. In addition, 2a*2b in the figure is a cam surface constituting the second cam body, 3a to 3f is a cam surface constituting the first cam body, and 4at
4b is a cam surface constituting the third cam body, 13 is a first contact, 16 is an operating means, 19 is a second contact, 20 is a third contact, 21 is an elastic body, and 28 is an operating body.

Claims (1)

[Claims for Utility Model Registration] A camshaft 1 that rotates at a reduced speed in conjunction with the main shaft, a first cam body 3a to 3f that is supported by the camshaft and has a plurality of cam surfaces arranged in the cam axis direction on its outer periphery; a second cam body 2a, 2b which is supported on one axis in the axial direction of the cam body with a gap corresponding to the width of the cam surface and has a plurality of cam surfaces disposed on the outer periphery; A third cam body 4a, 4b having a plurality of cam surfaces arranged on the outer periphery or on the other axis of the cam body with a gap corresponding to the width of the cam surface; a first contactor 13 for generating rocking motion of the needle bar, which is capable of swinging along an axis parallel to the rotational axis of the cam body and following the first cam body around the axis; and a knob 16. A first selection cam 17 that interlocks and moves the first contactor to a position facing an arbitrary cam surface of the first cam body, and a cam body that has a large diameter portion 7a that divides the shaft portion in the axial direction in the middle. A shaft 7 disposed parallel to the rotational axis, and a shaft 7 supported on one shaft portion of the shaft 7 to selectively face each cam surface of the second cam body and move in the axial direction so as to interlock with each other. a second contactor 19 for changing the cloth feed pitch that enables rocking; A third contactor 20 for changing the cloth feed pitch that enables movement in the axial direction and swinging around the axis, and the second and third contactors are always attached to both end surfaces of the large diameter portion 7a. an elastic body 21 acting on the second and third contacts so as to be engaged with the cam body and locked in a position facing the gap between each cam body; a second selection cam 17 interlocked with the knob 16; It has retaining parts 29 and 30 that engage with the opposing inner sides of the second and third contactors, and is linked to the second selection cam so that both liquid contactors are moved separately along the rotation axis against the elastic body. and an actuating body 28 capable of reciprocating when the first contactor faces a specific cam surface.