JPS6149993B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fixed position stop device for a continuous pattern stitch sewing machine, and more particularly to an improvement of a device for detecting a predetermined stop position of a continuous pattern using a sensor.

Generally, in this type of sewing machine, the pattern stitch generation mechanism is driven by the rotation of a pattern cam that is drivingly connected to the main shaft of the sewing machine, and continuous pattern stitches such as zigzag stitches and scallop stitches are performed, and the desired pattern can be sewn in one cycle of the pattern cam. One frame of the pattern is sewn.

During such sewing work, when changing the sewing direction with the sewing machine needle inserted, the worker must stop the sewing machine, but since a high-speed rotating electric motor is used to drive the sewing machine, the desired continuous pattern cannot be achieved. The sewing machine needle cannot be stopped at the stop position. Therefore, if you stop the sewing machine needle at an arbitrary position on a continuous pattern, you will start sewing the pattern over the pattern that has already been sewn, resulting in an irregular pattern. is provided with a fixed position stop device that stops the sewing machine needle at a predetermined position of a continuous pattern.

Further, even when thread cutting is performed after sewing is completed, it is necessary to stop the sewing machine needle at a predetermined position of a continuous pattern, and a fixed position stopping device is also provided in response to such a requirement.

As a fixed position stop device in such a continuous pattern sewing machine, a detection element is attached to a position corresponding to the sewing pattern origin position of the pattern cam, and this detection element is detected at the rotational position of the pattern cam, which is the sewing pattern origin position. There is a well-known device that includes an electrical detection device and uses a detection signal from the detection device to stop a sewing machine needle at the origin of a sewing pattern.

However, since the fixed position stop device in conventional continuous pattern sewing machines has a sensor attached to the cam, it is not possible to replace various pattern cams.

In addition, since the detection device was built into the sewing machine arm, there was a drawback that as the camshaft rotated, oil would scatter onto the functional parts including the detection device, staining these parts and sometimes causing functional problems.

In addition, since the detection device was built into the sewing machine arm, there was a drawback in that adjusting the stop position of the sewing machine needle required time and effort.

The present invention was made in view of the above-mentioned conventional problems, and its purpose is to prevent functional parts including sensors from oil leakage, and to easily adjust the stop position of a sewing machine needle. An object of the present invention is to provide a fixed position stop device for a pattern sewing machine.

To achieve the above object, the present invention includes a camshaft that is rotatably supported on the sewing machine arm with one end protruding from the sewing machine arm, and a camshaft that is fixed to the camshaft and transmits the rotation of the camshaft to a pattern stitch generation mechanism. a pattern cam that is fixed to one end of the camshaft to detect a predetermined stop position of the continuous pattern; an oil seal that is provided between the camshaft and an inner cover that is fixed to the end surface of the sewing machine arm; and a sensor. an outer cover that is attached to the sewing machine arm so as to cover functional parts, and the sensor includes a plurality of detectors that are adjustable and fixed to one end of the camshaft protruding from the end surface of the sewing machine arm at any position outside the sewing machine arm. It is characterized by including an arm.

Preferred embodiments of the present invention will be described below based on the drawings.

FIG. 1 shows a preferred embodiment of the fixed position stop device for a continuous pattern sewing machine according to the present invention, and a second embodiment of the fixed position stop device according to the present invention.
The figure shows the side view. The same members in each figure will be described with the same reference numerals.

In the figure, a cam shaft 12 is rotatably supported on a sewing machine arm 10 that houses a drive mechanism including a pattern stitch generation mechanism, with one end protruding from the sewing machine arm 10, and a fixing screw 14 is attached to the cam shaft 12. Pattern cams 18 and 20 that operate in conjunction with a pattern stitch generation mechanism (not shown) are attached to the fixed bush 16 with mounting screws 22 and 24. The pattern cams 18, 20 are replaced as appropriate depending on the type of sewing pattern, and the pattern cams 18, 20 are attached to the cam shaft 1.
By transmitting the rotation of No. 2 to the pattern stitch generation mechanism, continuous pattern stitches in a desired shape are performed.

Also, a cam shaft 1 protruding from the sewing machine arm 10
A magnetic sensor 26 is provided at one end of 2 to stop the sewing machine needle at a predetermined stop position, and the magnetic sensor 26 is constructed as follows.

That is, a mounting screw 3 is attached to one end of the sewing machine arm 10 via a washer 28 and a toothed washer 30.
A pair of detector arms 34 and 36 are attached at 2, and a magnet 38 is attached to the tip of each detector arm 34 and 36 at a position corresponding to a predetermined stopping position of the sewing pattern.
40 are fixed respectively. In addition, a yoke 44 is attached to the inner cover 42 fixed to the sewing machine arm 10.
is fixed, and as the camshaft 12 rotates, each magnet 38, 40 comes to a position facing the yoke 44, thereby detecting a position corresponding to the sewing pattern origin position.

A wiring board 46 is provided between the yoke 44 and each of the magnets 38 and 40 with a predetermined gap therebetween. A circuit (not shown) is wired. Further, the detection circuit wired to the wiring board 46 is connected to the sewing machine arm 10.
It is connected by a cable 52 to a sewing machine drive stop device (not shown) provided externally, and a detection signal from the detection circuit is outputted to the sewing machine drive stop device (not shown) through the cable 52. As a result, the sewing machine needle stops at a predetermined stop position indicated by a black dot in FIG.

Further, a packing 54 is provided between the sewing machine arm 10 and the inner cover 42, and furthermore, a packing 54 is provided between the sewing machine arm 10 and the inner cover 42.
An oil seal 56 is provided between the sensor 26 and the camshaft 12, and is configured to prevent oil from scattering onto the sensor 26 and the detection circuit due to rotation of the camshaft 12 and contaminating these functional parts.

An outer cover 58 is attached to the inner cover 42 so as to cover functional parts including the magnetic sensor 26, and these functional parts are protected from the outside.

FIG. 4 shows another preferred embodiment of the fixed position stop device for the continuous pattern stitch sewing machine according to the present invention, in which the tip of the sewing machine arm 10 is connected to the tip of the camshaft 60 via a packing 62 and a sleeve 64. The adapter 66 is screwed so that it protrudes, and the detector arms 34, 36 are attached to the tip of the adapter 66.
is fixed.

As described above, the characteristic feature of the present invention is that the functional parts including the magnetic sensor 26 are attached to the sewing machine arm 10.
The inner cover 42 and the camshaft 1
An oil seal 56 is provided between the two.

The fixed position stop device for the continuous pattern stitch sewing machine according to the present invention has the above-mentioned configuration, and its operation will be explained below.

By the rotation of the camshaft 12 which is drivingly connected to the main shaft of the sewing machine, the pattern cams 18 and 20 transmit the rotation of the camshaft 12 to the pattern stitch generation mechanism. Along with this, the sewing machine needle is driven by the pattern stitch generation mechanism, and the desired continuous pattern stitch is performed.

In this case, since the oil seal 56 is provided between the inner cover 42 and the camshaft 12, oil will not be scattered to the magnetic sensor 26 or the detection circuit as the camshaft 12 rotates, and these parts cannot be defiled. Therefore, oil will not cause malfunction of each part.

Then, when changing the sewing direction with the sewing machine needle inserted during sewing work, or when cutting the thread after sewing is completed, the sewing machine needle is stopped and the magnetic sensor 26 detects the stop position. By outputting a detection signal from the circuit to the sewing machine driving device, the sewing machine needle stops at a predetermined stop position of the continuous sewing pattern.

When adjusting the stop position of the sewing machine needle, there is no need to disassemble the internal mechanism of the sewing machine arm 10 unlike the conventional device, and the adjustment can be easily made by simply removing the outer cover 58.

As described above, according to the present invention, since the sensor is attached to the camshaft, various pattern cams can be replaced, and a single sewing machine has the advantage of being able to sew various continuous patterns. .

Further, according to this embodiment, since the functional parts including the sensor are adjustably fixed to the adapter protruding from the outside of the sewing machine arm, the stopping position of the sewing machine needle can be easily adjusted.

Further, an adapter is attached to one end of the camshaft in a state that projects from the sewing machine arm, and a sensor at the tip of the adapter into which the sleeve is fitted is attached, so that the sensor can be attached and detached easily and in a stylish manner. Furthermore, in this embodiment, a gasket is tightly fixed between one end of the camshaft and the sleeve, and an oil seal is provided between the inner cover and the camshaft to prevent oil leakage from the functional parts including the sensor. can be prevented from

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional configuration diagram of essential parts showing a preferred embodiment of a fixed position stop device in a continuous pattern sewing machine according to the present invention, and Fig. 2 is a side view showing the device shown in Fig. 1 with the outer cover removed. 3 are explanatory diagrams showing stopping positions of a continuous pattern, and FIG. 4 is a sectional view of a main part showing another preferred embodiment of a fixed position stopping device in a continuous pattern sewing machine according to the present invention. The same members in each figure are given the same reference numerals, 10 is the sewing machine arm, 12 is the cam shaft, 18 and 20 are the pattern cams, 26 is the magnetic sensor, 42 is the inner cover, 5
6 is an oil seal, and 58 is an outer cover.

Claims (1)

[Claims] 1. In a continuous pattern sewing machine having a camshaft rotatably supported by a sewing machine arm, and a pattern cam fixed to the camshaft and transmitting rotation of the camshaft to a pattern sewing generation mechanism, A sensor for detecting the position is provided at one end of the camshaft,
The sensor includes a plurality of detector arms that are adjustable and fixed at any position outside the sewing machine arm to one end of a camshaft that protrudes from the end surface of the sewing machine arm, and includes a detected element fixed to the detector arm and the sewing machine arm. A predetermined position of the pattern cam is detected by a detection device fixed to the side, an inner cover is provided on the end surface of the sewing machine arm, and an oil seal is provided between the inner cover and the cam shaft, Furthermore, the fixed position stop device for a continuous pattern stitch sewing machine is characterized in that the sensor provided on the outside of the inner cover is covered by an outer cover provided on the inner cover.