JPS581953B2 - Zigzag sewing machine - Google Patents

Description

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

In this pattern sewing device, various pattern stitches are selected by rotating only one dial, and each one of two laminated cams is used to control the sewing pattern in conjunction with the rotation of the dial.
Two needle bars and a cloth feed mechanism are selectively drivingly connected.

Conventionally, in this type of sewing machine, the pattern stitch selection operation section has at least a zigzag width conversion dial, a fabric feed width conversion dial,
It consists of three dials, a selection dial for selecting one of the built-in pattern patterns, and when making a selection operation, the zigzag width conversion dial and cloth feed width conversion dial are rotated to a certain position, and then the sewing pattern is A desired sewing pattern can be selected and set by operating a detachment operation member for detaching a contactor that is in contact with one of the laminated cams from the cam and then rotating the pattern selection dial. It was necessary.

There was also a drawback that the dial could not be rotated continuously in the same direction.

Therefore, the selection operation was extremely troublesome and required skill, and the mechanism itself was complicated.

Furthermore, even in devices where a pattern can be selected immediately by rotating a single pattern selection dial, the pattern selection operation takes time due to mechanical reasons, and the fabric feed width conversion member and zigzag width conversion member are required to select the pattern. There was a drawback that the pattern selection member had to be operated after being set at a certain position.

The object of the present invention is to create a pattern sewing device that avoids the drawbacks of the prior art as described above, and this object is to create a pattern sewing device that can sew straight stitches, zig-sag stitches, as well as zigzag and super stitches.
Selection can be made with just one operation of the two dials, and the dials can be rotated forward and backward, as well as continuously rotating in the same direction, simply by aligning the sewing pattern displayed on the dial with a certain mark. The desired sewing pattern is selected, and the above-mentioned selection mechanism is housed in one base frame, and is therefore formed to be drivingly connected to the drive mechanism of the sewing machine by attaching the base frame to the sewing machine frame. .

Embodiments of the present invention will be described based on the drawings.

1 shows a base frame to be attached to a sewing machine frame 2 by screws 3.

Numerals 4a and 4b are laminated cams for controlling the needle bar and cloth feeding movement according to the sewing pattern, and the cam group 4a is for sandwiching the worm gear 5 and generating swinging movement of the needle bar upward in FIG. , and is divided into a group of cams 4b on the lower side for controlling the amount and direction of cloth feed.

The laminated cams 4a, 4b are integrally constructed with the worm gear 5, are rotatably supported on a shaft 7 fixed to the base frame 1 by screws 6, and are connected to the worm 8 and the worm gear 5 by an upper shaft 9 driven by a sewing machine driving member. Upper axis 9 through
It is formed so that it can rotate continuously at a constant reduction ratio.

The shaft 7 is formed as an eccentric shaft for adjusting the engagement between the worm 8 and the worm gear 5.

Supporting arms 10a belonging to the laminated cams 4a, 4b,
10b is rotatably supported on a shaft 12 parallel to the axis of the laminated cam, and the shaft 12 is fixed to the base frame 1 by a screw 11.

The bearing arm 10a belongs to the laminated arm 4a and has a contact 13a slidably guided on two mutually parallel axes 14a, 15a fixed to one end thereof.

The support arms 10a are provided on both sides of the contactor 13a, and are connected to the shaft 14.
a, 15a and via the shaft 12.

A pin 11 is fixed to the other end of the support arm 10a.
A spring 16 having one end engaged with a spring catch 19' fixed to the base frame is hung on 7, and the spring 16 presses the support arm 10a and hence the contact 13a against the laminated cam 4a.

According to the amount of change in the lift of the laminated cam 4a driven by the upper shaft 9, the support arm 10a and the contact 13a are moved together with the shaft 1.
2, and is drivingly connected to the needle bar swinging mechanism for swinging the needle bar through a pull bar connecting rod 18 pivotally supported by a pin 17 fixed to the other end.

The bearing arm 10b belongs to the laminated cam 4b and has a contact 13b slidably guided on two mutually parallel shafts 14b, 15b fixed to one end thereof.

The support arms 10b are provided on both sides of the contactor 13b, and are connected to the shaft 14.
b, 15b and axis 12? integrally formed through the

One of the two supporting arms 10b is longer than the other, and a spring 19 engaged with a spring hook 19' similarly fixed to the base frame 1 moves a cloth feed link 22, which will be described later, to the ground in Fig. 3. As a result, the support arm 10b and therefore the contact 13b are pressed against the laminated cam 4b.

According to the amount of change in lift of the laminated cam 4b driven by the upper shaft 9, the support arm 10b swings around the shaft 12 integrally with the contact 13b via the contact 13b, and has a spherical nut 20 at one end. It is connected to a known feed adjusting box (not shown) via a cloth feed link 22 which is adjustable and held by a spring 21, and is used to change the amount and direction of cloth feed.

One end of the spring 19 is hung on a connecting rod 22.

Contacts 1 to 3 provided on the above-mentioned support arms 10a and 10b
In order to selectively engage each of the laminated cams 4a and 13b with one of the laminated cams 4a and 4b, a shaft 27 parallel to the shafts 7 and 12 is supported on the base frame 1, and a contactor 13a is mounted on the shaft 27. ,
Cams 28a and 2 each have a peripheral cam portion and an end cam portion for separating l3b from the laminated cams 4a and 4b.
8b is fixed.

A lever 3 0 a t 3 0 b that slides the contacts 13 a and 13 b on the top of the base frame 1 is a stepped screw 3 1 .
a, 31b, and levers 30a, 3
The pins 32a and 32b fixed to one end of the levers 30a and 32b are respectively inserted into elongated holes provided in the contacts 13a and 13b, and the other ends of the levers 30a and 30b are fitted with screws 33a and 33b.
One each of the laminated cams 4a and 4b and the contact 13a
, 13b are fixed to adjust the levers 34a, 34b to set them at desired positions.
Bin 3 5 a y fixed to the other end of y 3 4 b
35b is each axis 1 of the support arms 10a and 10b.
Spring wires 3 6 a, 3 6 wrapped around 5 a, 15 b
b is configured to always be pressed against the end cam portions of the cams 28a and 28b.

Therefore, each contactor 13a, 13b and the laminated cam 4a
.
, 28b, depending on the amount of change in the lift of the cam part, the lever 3
4a, 34b, and therefore the lever 30a, 30b is rotated around the stepped screws 31a, 31b.
Therefore, it is configured to be achieved.

Lever 39a, 3 is provided on the shaft 12 in order to separate the contacts 13a, 13b from a specific cam of the laminated cams 4a, 4b.
9b is rotatably supported and the levers 39a, 39
Pins 37a and 37b are fixed to one end of each of the support arms 10a and 10b, and the other end is connected to the support arms 10a and 10 by eccentric screws 38a and 38b.
b, and the contacts 13a, 13b are fixed to the laminated cams 4a,
Pin 37a is slightly detached from the maximum diameter of pin 4b,
37b is adjusted by eccentric screws 38a and 38b so that it touches the maximum diameter of cams 28a and 28b.

The outer circumferential surfaces of the cams 28a, 28b are provided with irregularities as peripheral cam portions for engagement and disengagement with the bins 37a, 37b, if necessary.

The L-shaped gear support arm 40 is rotatably supported on the shaft 21,
A gear 24 is rotatably supported on the pin 43 at one end, and the gear 24 meshes with the gear 23 fixed to the shaft 27.

The other end of the L-shaped gear support arm 40 is fixed to the base frame 1 with screws 44.

The gear 24 meshes with a gear 25 coaxially with the dial 26.

The moderation plate 42 is fixed to the base frame 1 by screws 41, and the other end of the moderation plate is fitted into a notch 28a' on the outer circumference of the cam 28a for positioning to accurately maintain the selected pattern position. used for.

In the apparatus according to the present invention, the laminated cams 4a and 4b are driven via the worm 8 and the worm gear 5 by the rotation of the upper shaft 9 driven by the sewing machine driving member.

The laminated cams 4a, 4b rotate according to the rotation of the laminated cams 4a, 4b.
The contacts 13a, 13b that come into contact with the bearing arm 10a
, 10b is rotated about the axis 12, and the bearing arm 1
0a gives reciprocating motion to the pull bar linking rod 18 via the pin 17, and as a result, a needle bar swinging mechanism (not shown) connected to the draw rod linking rod is driven.

On the other hand, the cloth feed link connected to the support arm 10b via the spring 21 and the spherical nut 20 reciprocates in accordance with the rotation of the support arm 10b, and causes the cloth feed adjustment box (not shown) connected to the cloth feed link to move the cloth. give.

Also, depending on the type of sewing pattern selected, the laminated cams 4a, 4
b and the contacts 13a, 13b are not in contact with each other, and the lever 39a,
The bottles 37a, 37b fixed to the cam 28a,
28b, and as a result, the support arm 1
0a and 10b are not rotated around the shaft 12, so the pull rod connecting rod 18 remains stationary at a fixed position, and the needle bar connected thereto does not cause any oscillating movement, and the needle bar moves up and down in the fixed position. and
Since the feed link rod 22 also remains stationary at a fixed position, the inclination angle of the cloth feed adjustment box (not shown) connected thereto is also kept constant, and a constant cloth feed movement is provided.

"RU""O""WA" on the dial 26 shown in FIG.
The selection of sewing patterns for "Ka" and "Yo" is performed as follows.

When the dial 26 is rotated when selecting the next desired sewing pattern from one sewing pattern displayed on the dial 26, the gear 2
5, 24, 23, the shaft 21 is rotated, and the pin 37a is located in a recess on the outer circumference of the cam 28a, 28b fixed to the shaft 27, and the pin 37a is fixed to the lever 39a, 39b. , 37b are in contact with the convex portions of the cams 28a, 28b, and the contacts 13a, 13b are connected to the laminated cams 4a, 4.
When the dial 26 is further rotated, the pins 35a and 35b move according to the end face cam part of the cam 28a and 28b, and the pins 35a and 35b are fixed and are stepped on the top of the base frame 1. A pin 32 fixed to levers 30a and 30b pivoted by screws 31a and 31b
a, 32b connect contacts 13a, 13b to laminated cams 4a, 4
b to a position where it engages with each desired one.

When the dial 26 has been rotated so as to match a certain mark of the desired sewing pattern, the moderation plate 42 fixed to the base frame 1 with the screw 41 engages with the notch 28a provided on the outer periphery of the cam 28a, and the sewing pattern is selected. Fix and hold the sewing pattern position, and press pin 37.
a, 37b are located in the recesses on the outer periphery of the cams 28a, 28b, and the contacts 13a, 13b are located in the laminated cams 4a, 4.
b, respectively, corresponding to the desired sewing pattern.

The sewing pattern is selected in this way, and as a result, the laminated cams 4a, 4b are rotated by the rotation of the upper shaft 9, and the contacts 13a, 1
The supporting arms 10a and 10b that support the connecting rod 3b are swung, and this swiveling motion is transmitted to the needle bar oscillation mechanism (not shown) by the pull rod link 18, the needle bar swings, and the feed link 22 moves up and down. A desired sewing pattern is formed by the movement.

The selection of the straight stitches of "A", "Open" and "Ha" is performed by aligning the display of "A", "RO" and "Ha" on the dial 26 with a certain mark.

In this case, each one of the laminated cams 4a and 4b is made smaller in diameter than the other pattern cams, and the contacts 13a and 13b are separated from the laminated cams 4a and 4b, so that the cams 28a and 28
Pins 37a and 37b are pressed against the outer periphery of b, and the support arms 10a and 10b are kept at a constant angle around the shaft 12 by the uneven portions on the outer periphery. As a result, the needle bar connected to this is not swung by the rotation of the laminated cams 4a and 4b, but only moves up and down in a fixed position, and the cloth feed link 22 also remains stationary in a fixed position, so that the needle bar connected to this The inclination angle of the adjustment box is also kept constant, and a constant cloth feeding movement is performed.

"Ni""O""He""T""Chi""Ri""Nu"
The zigzag stitch is selected by engaging only the contact 13a with the laminated cam 4a and disengaging the contact 13b from the laminated cam 4b.

As a result, the needle bar undergoes an oscillating movement and a constant cloth feeding movement takes place.

The present invention houses a pattern sewing device in a base frame 1, and the base frame 1
Just by attaching it to the sewing machine frame, it will be linked with other parts of the sewing machine, and there is little processing required on the sewing machine to attach the pattern device. Straight stitching, zigzag stitching, and super pattern stitching are all selected by simply aligning the pattern with a certain mark, and pattern selection operations can be performed by rotating the dial forward, backward, or continuously in the same direction. It has an extremely large effect.

The effect of rotating the dial in the forward and reverse directions and continuously in the same direction is achieved by the cam 2 for selecting double-pattern stitching, which is drive-coupled with the dial.
8a and 28b can be obtained by appropriately selecting the pressure angles of the outer circumferential surface cam portion and the end surface cam portion, respectively, as summarized from the configuration and operation described above.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a pattern sewing device according to the present invention, FIG. 2 is a top view of the device, FIG. 3 is a partially cutaway front view of the same device, and FIG. 3a is a lever 39a, 39b and pin. 37a and 37b. 1...Foundation frame, 2...Sewing machine frame, 4
a, 4b... Laminated cam, 5... Worm gear, 7, 12, 2γ... Shaft, 8...
・Worm, 9... Upper shaft, 10a, 10b...
...Support arm, 1 3 a t 1 3 b...
...Contacts, 14a, 15a; 14b, 15b---
Mountain pin, 17, 18...Draw rod link, 20...
... Spherical nut, 21 ... Spring, 22 ...
...Feeding lever, 28a, 28b...Cam,
30a, 30b-・-lever, 31a, 31
b...Stepped screw, 34a, 34b...
・Lever, 35a, 35b, 37a, 37b...
...Pin, 38a, 38b...Eccentric screw, 39
a, 39b...Reba.

Claims (1)

[Claims] 1. In a pattern sewing device for an automatic zigzag sewing machine, three mutually parallel shafts 7, 12, 21 are supported at arbitrary intervals on a base frame 1 to be attached to a sewing machine frame 2. , the first shaft 1 has two laminated cams 4a for pattern sewing control,
4b is rotatably supported, and the second shaft 12 has two supporting arms 10a, 10b and two levers 39a.
, 39b are rotatably supported on the shaft, and two mutually parallel pins 14a, 15a are fixed to one end of each of the two support arms 10a, 10b.
; Both laminated cams 4a, 4b on 14b, 15b
Each contactor 13a, 13b belonging to each of the two bearing arms 10a, 10b is slidably supported.
Each lever 39a is provided with a pin 37a, 37b, respectively, at the other end by a respective eccentric screw 38a, 38b.
, 39b are fixed to the other end of the first support arm 10a. A connecting rod 22 drivingly connected to a cloth feeding mechanism is connected to the hole 10b' at the other end of the support arm 10b, and the third shaft 27 has two patterns each having a peripheral cam portion and an end cam portion. Sewing selection cams 28a and 28b are rotatably supported, and the peripheries of both cams 28a and 28b are in contact with the peripheries, and the respective bins 37a of both levers 39a and 39b are
It is formed so as to control the contact and separation of each contactor 13a, 13b with the corresponding laminated cam 4a, 4b via the y37b, and the end cam portion of both cams 28a, 28b is provided with the base frame 1. Two levers 3 rotatably supported on the top
Pins 35a and 35 fixed to one end of each of pins 4a and 34b
The pins 32a and 32b fixed to one end of each of the other levers 30a and 30b, which are in contact with the levers 34a and 34b, are engaged with the contacts 13a and 13b, and both cams By the rotation of 28a and 28b, each laminated cam 4a, 4b, each contactor 13a, 13b, the periphery of each pattern stitch selection cam 28a, 28b, each pin 37a, 37b of both levers 39a, 39b, and both lever 3
The pins 35a and 35b of 4a and 34b are selectively engaged with the end cam portions of the cams 28a and 28b to select a sewing pattern, and only one button is used to display the sewing pattern. The dial 26 is the cam 2 for selecting both patterns.
8a and 28b, and by appropriately selecting the pressure angles of the outer circumferential surface cam portion and the end surface cam portion of both the cams 28a and 28b, the dial 26 can be rotated in the forward and backward directions and continues in the same direction. A pattern sewing device characterized in that the pattern sewing device is configured such that it can be rotated by the user.