JPS5851900Y2 - Needle position adjustment device in sewing machine - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a needle position adjustment device that is attached to a sewing machine and allows the needle drop position to be adjusted with respect to the hook and throat plate.

Generally, needle position adjustment involves adjustment in the Y direction (feeding direction) to adjust the gap between the needle and the tip so that the needle thread loop formed by the needle is securely captured by the tip of the hook body, and adjustment in the Y direction (feeding direction) to adjust the center of the needle on the M base line. Adjustment in the X direction (direction perpendicular to the feeding direction) is performed to adjust the lateral position of the needle relative to the needle hole so that the needle drop portion is located at the center of the needle hole in the needle plate.

Conventionally, the needle position has been adjusted by using an eccentric shaft (pin) at a pivot point of a needle bar support frame that supports the needle bar.

In this case, the needle bar supported by the needle bar support frame draws a certain trajectory (curve) by rotating an eccentric pin, and therefore the needle position cannot be adjusted to a position other than that specific curve. However, the range of adjustment was limited.

The purpose of this invention is to separate the adjustment means into two locations, and to make adjustments in the X direction and Y direction individually using these separate adjustment means, so that adjustments can be made in all positions.

A specific example thereof will be described below with reference to the drawings. 1 is a hook, 2 is a throat plate in which a needle hole 3 is formed, and 4 is a head on which a needle bar drive device that interlocks with the upper shaft is installed.

Reference numeral 5 denotes a mounting frame whose upper part is pivoted 6 to the machine frame and has a slot 7 formed at its lower part, and mounting parts 8 and 9 for holding the needle bar support frame 10 are bent at the upper and lower ends thereof, respectively.

The lower mounting portion 9 has a groove 11 into which a triangular cam 15 (described later) is inserted into the rotary member 9, and a slot 12 that communicates with the groove 11 and is perpendicular to the slot 7.

The needle bar support frame 10 has a pivot shaft 1 attached to the mounting parts 8 and 9.
3.14, and is supported at the upper and lower ends and is swingably attached to the mounting frame 5.

The lower pivot 14 has a flange 14a that contacts the edge of the slot 12 and a step 14b, and has a mounting portion 9.
slot 1) 12, and the flange 14a is inserted into slot 1
After contacting the two edges, a triangular cam 15 is fitted onto the end protruding from the slot 12 and caulked.

A wave washer 17 is interposed between the triangular cam 15 in the groove 11 and the mounting portion 9, and is designed to prevent the triangular cam 15 from moving inadvertently.

Reference numeral 18 indicates a needle bar supported by the needle bar support frame 10 so as to be able to slide up and down, 19 indicates a needle, and 20 indicates a needle inserted into the slot 9,
It is a stopper for fixing.

Next, to explain the adjustment of the needle drop position of the device having the above configuration, as shown in FIG. This is accomplished by rotating the mounting frame 5, whose upper portion is pivoted, in the direction of the arrow shown in FIG. 1, thereby moving the needle bar 18 to the left and right together with the needle bar support frame 10.

Thereafter, the mounting frame 5 is fixed to the machine frame using the fasteners 20.

Next, adjustment in the X direction so that the central needle entry point on the M base line coincides with the center hole of the needle hole 3 is performed by engaging a two-pronged tool (not shown) in the locking groove 15' of the triangular cam 15. This is done by rotating the triangular cam 15 within the groove 11 against the frictional resistance of the wave washer 17.

That is, since the mounting frame 5 is fixed to the machine frame as described above, when the triangular cam 15 is rotated, the pivot shaft 14 to which the triangular cam 15 is attached moves within the tenth hole 12, and the needle bar 18 is moved to the second position. Make corrections in the direction of the arrow shown in Figure 2.

As described above, the needle position adjustment device of the present invention has separate adjustment means in the X direction and adjustment means in the Y direction so that they can be adjusted separately, making it possible to adjust the needle to any position. It is something.

[Brief explanation of drawings]

Fig. 1 is a side view of a sewing machine equipped with a device according to the present invention, Fig. 2 is a front view of a sewing machine head equipped with the device, Fig. 3 is an exploded view of a part of the device, and Fig. 4 is a side view of a sewing machine equipped with a device according to the present invention. A partial cross-sectional view of the device,
FIG. 5 is a plan view showing the positional relationship between the needle, throat plate, and hook. 1...Kettle, 1a...Sword tip, 2...
... Throat plate, 3 ... Needle hole, 5 ... Mounting frame, 7 ... Slot, 8 ... Mounting part, 9
......Mounting part, 10...Needle bar support frame, 1
1...Concave groove, 12...Slot, 13
...Axis, 14...Axis, 14a...
...Trim part, 14b...Step part, 15...
・Triangular cam, 15...Latching groove, 17...
- Wave washer, 18... Needle bar, 19... Needle, 20... Stop.

Claims (2)

[Scope of utility model registration request] (1) A mounting frame that is attached to the machine frame and has mounting sections on the top and bottom, a needle bar support frame whose upper and lower ends are pivotably supported on the mounting sections, and the needle. A needle bar support device for a sewing machine has a needle bar that is slidably supported in the vertical direction on a bar support frame. At least one of the upper and lower mounting parts 9 is mounted so that its mounting position can be adjusted in any direction perpendicular to the
A slot 12 is formed in a direction substantially perpendicular to the adjustment direction of the mounting frame 5, into which the pivot shaft 14 is slidably inserted, and the pivot shaft 14 is provided on the side opposite to the side supporting the needle bar support frame. An adjustment device supported by the mounting frame 5 is connected to the end, and the needle can be moved within the slot by manual adjustment of the adjustment device, and thus the needle is supported by the needle bar support frame 10. A needle position adjustment device in which the rod 18 can be adjusted in the feed direction and in the direction perpendicular to the feed direction (iDl). (2) The adjusting device has a triangular cam 15 that fits into a groove 11 formed in the mounting portion 9 perpendicularly to the slot 12 and into which the pivot shaft 14 is fitted. needle position adjustment device.