JPH0423517Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) The present invention relates to a sewing machine equipped with a zigzag decorative sewing feed device according to the generic concept of claim 1 of the utility model registration claim.

(Prior Art) Various sewing machines of this type are known. In one of these sewing machines, the zigzag topstitch feeder is formed independently as a replaceable component and is fixed to the main body by screws. After the components have been assembled, the zigzag stitch feeding device is driven by a pinion adapted to mesh with a gear on a drive shaft rotatably supported within the main body. If there is backlash in the feeding device, readjustment after adjustment has been possible only by disassembling a portion of the machine and inserting a spacer such as a washer.

(Problem of the invention) The present invention provides a means for adjusting the drive device for the control cam body in a zigzago decorative stitch feeder from the outside by a simple operation and without removing any part so that there is no bump crash. It is to provide.

(Means for solving the problem) This problem is solved by the configuration described in the claims for utility model registration.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

In the sewing machine 1 shown in FIG. 1, the position of the machine side drive shaft 3 is indicated by a dotted line in the overarm 2, and operation knobs 5 (for feed length and feed direction) and 7 for operating the control and selection means are shown. Also shown is the component 9 as a block with a zigzag decorative stitch feeding device 10 (for needle position) and the pivot axis A.

In the plan view of the sewing machine 1 shown in FIG. 2, the overarm cover 11 is removed, so that the structural unit 9 of the zigzag decorative stitch feeding device 10 can be clearly seen. In the structural unit 9, in addition to the control cam body 13 and the cam contactor 15, there are control and selection means for controlling the position of the feed area, needle flow, feed amount, and feed direction for cam-controlled sewing. It is provided on a common support 17. The control cam is an object that is operated by rotating the operation knobs 5 (for feed length and feed direction) and 7 (for needle position) for operating the control and selection means, and comes into contact with the cam contactor caused by the operation. A specific sewing machine operation, such as the feed length, is set by selecting a particular cam of the body 13 or by switching on and off the drive from the individual cam contacts to the needle drive. A hollow rotary shaft 19 is fixed to the support 17, and a shaft 21 is inserted on the axis A through the shaft. The end of the shaft 21 is supported in the hole 23 of the overarm 2. For the axes of rotation 6,8 on the operating knobs 5 and 7 for operating the control and selection means, the overarm 2 is provided with a hole, which hole is significantly larger than the respective diameter of the axes of rotation 6 and 8. has been done. The support body 17 has a shaft 2
An adjusting screw 25 is mounted on a crosspiece 27 in the casing of the overarm 2 at the end remote from the axis A of the overarm 2 . The support body 17 has an adjustment screw 25
After adjustment, it is fixed at that position by a fixing screw 29 beside the overarm 2 or a fixing screw 31 inserted into the side of the overarm 2. In the illustrated example, the hollow rotating shaft 1
9 is at the same time a support for the cam contact 15 and a lever for the transmission and regulation of the functional movements within the component 9.

Particularly, the structural unit 9 of the zigzago decorative stitch feeding device 10 assembled outside the sewing machine 1 is fitted into the overarm 2 of the sewing machine 1 from above, and after inserting the shaft 21 laterally, it is fixed as described above.

The gearwheel 35 provided for transmitting the rotational movement by the driveshaft 3 to the component 9 is loosely fitted onto the drive gearwheel 33 of the driveshaft 3, as long as the adjusting screw 25 does not come into close contact with the crosspiece 27. By rotating the adjusting screw 25, the required backlash between both gears 33 and 35 is adjusted accurately, and the fixing screws 29 and 31 are rotated.
Fixed by

Internally, the tilt of the structural unit 9 caused by the adjustment of the batch is small so as not to affect the functions of other elements in the structural unit 9. Furthermore, further mechanical connections 37, 39, 41, 43 of the component 9 with other parts of the machine are provided, together with means allowing individual adjustment.

The holes for the rotation axes 6, 8 of the operating knobs 5, 7 for operating the control and selection means are completely covered by the operating knobs 5, 7 in each position.

(Effects of the invention) The advantage obtained with the invention is that the backlash of the pinion can be adjusted accurately in the shortest possible time without any problems by turning the entire component. Further, the backlash can be adjusted from the outside by operating an adjustment screw without removing any parts.

[Brief explanation of drawings]

Figure 1 is a perspective view of the sewing machine, Figure 2 is a plan view of the structural units of the sewing machine, and Figure 3 is the same as in Figure 2.
FIG. 3 is a cross-sectional view of the structural unit of the line. Symbols in the figure: 1... Sewing machine, 3... Drive shaft, 9...
... Constituent unit, 13 ... Control cam body, 15 ... Cam contactor, 17 ... Support body, 25 ... Adjustment screw, 3
5...Gear.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A zigzag decorative sewing feed device, including a control cam body, a cam contactor, and control of the feed area position, needle flow, feed amount, and feed direction for sewing controlled by the cam. In a sewing machine in which the selection and control means for are connected to the structural units on a common support, the support 17 with the component 9 is pivotable about the axis A of the shaft 21 mounted on the sewing machine 1. The backlash between the gearwheel 33 on the drive shaft 3 on the machine side and the gearwheel 35 for driving the control cam body 13 in the component 9 can be adjusted by pivoting the support 17 by means of the adjusting screw 25. The sewing machine is characterized in that: 2. The position of the structural unit 9 is such that it can be fixed to the sewing machine 1 by means of fixing screws 29 and 31. A sewing machine according to claim 1 of the utility model registration claim. 3. The shaft 21 and the axis A coincide with the rotation axis of the cam contactor 15. A sewing machine according to claim 1 or 2 of the utility model registration claim.