JPS602074B2 - sewing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sewing machine, in particular, the formation of straight seams is performed purely mechanically, and the formation of other patterned seams is performed using an electronic circuit including a static electronic memory for storing and generating patterns. This method employs a method in which the process is automatically performed via the .

So-called electronic sewing machines, which are equipped with a static memory device and an electric device that determines the lateral vibration position of the sewing machine needle bar and the amount of fabric feed for each stitch based on signals from the device, can handle a larger number of stitches than conventional purely mechanical sewing machines. Sewing machine sewing has the advantage of replacing complex and bulky mechanical parts such as pattern cams and pattern selection devices with small electronic parts, or relatively easily achieving highly complex functions that are difficult to put into practical use with mechanical systems. Approximately 90% or more of the work is straight-line stitching, and there is no need to rely on electronic sewing machines or computerization to form straight-line stitches, and even simple straight-line stitches can be done using electronic sewing machines. If the sewing machine is controlled by a pure mechanical system, even during simple straight sewing, many electrical parts including the above-mentioned electric device must be energized, resulting in considerable power consumption and temperature rises. The operating noise tends to be louder than when sewing a straight line, and the components and connections of the electronic circuit are extremely complex, so if even a small part of the machine is disturbed, the essential straight stitch will be impossible. To avoid this risk, electronic sewing machines are designed to perform simple straight stitches purely mechanically by switching to an operating system that does not depend on electronic circuits.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows the appearance of a sewing machine 1 of the present invention, 2, 2...
・Pattern selection switch button 3 provided corresponding to various allover patterns other than simple straight stitch and relatively frequently used.
, 3' calls out various sewing patterns that are used relatively infrequently using the sewing pattern number (2 digits in the example) given to each one, and at the same time displays the number in the display window (the figure shows 25 digits). 4 is a switch button for clearing the above-mentioned call and display.

6 (Fig. 2) is a needle shank support for a zigzag sewing machine, 6 is a needle bar, 7 is a sewing machine needle, 8 is a throat plate provided with a zigzag needle hole 8', and 9 is a portion of the zigzag needle hole 8'. A needle plate for straight sewing is arranged such that a needle hole 9' for straight sewing can move forward and backward;
0 is a needle hole switching crank which, when operated clockwise against the action of the straight sewing throat plate release spring 11, positions the straight sewing needle hole 9' in the lowered position of the needle 7; 12 is a needle hole switching crank; A horizontal vibration rod, 13 is a pulse motor for controlling vibration, 14 is a crank pin of the device, 15 is a feed adjuster core for posture control of a feed adjuster (not shown) of the sewing machine, and 16 is a pulse motor for controlling feed. The pulse motors (generally electric devices) 13 and 16 are not described in detail, but when the electronic circuit (not shown) is activated by the switch SW, in order for the sewing machine 1 to operate as an electronic sewing machine, is the above switch button 2, 2... or 3, 3'
When an all-over pattern is selected by the operation, the sewing machine automatically selects the desired all-over pattern by sequentially changing the working position in accordance with the signals of the all-over pattern sequentially output from the storage device as the sewing machine rotates. It is something that allows people to achieve success.

20 is rotatable with respect to the frame of the sewing machine so that automatic pattern sewing range A or straight line general adjustment range S can be selected via range C for switching the operation mode of the sewing machine with respect to indicator 21 on the frame of the sewing machine. 22 is an operation mode switching dial in which the following various cams are fixed in a layered manner on a coaxial line, and reference numeral 22 indicates the switch SW only when range A of the dial 20 is selected.
, (assuming that it is placed in the proper place) is closed by the opening/closing cam, and 23 is the needle bar lateral vibration in the first half of the range C when the dial 20 is being switched from the range A to the range S. A lateral vibration fixing cam 25 is arranged so that the fixing piece 24 is raised to the second illustrated position and the V-shaped portion 24' forces the crank pin 14 to the straight sewing position; A needle hole changing cam 28 swings the switching lever 26 counterclockwise as shown in the figure and sets the straight stitch needle plate 9 to the operating position via the needle hole switching rod 27. 32 is a cam body for adjusting spring pressure, and 35 is a cam body for switching the spring pressure of the regulator. For example, the dial 20 and each of the cams 32, 22, 25, 23, 28 and is provided to be movable in the front-rear direction.

Further, 31 is attached to one end of a feed control lever 38 whose central portion is pivotally mounted 38' to the sewing machine frame and whose other end is operatively connected to the feed adjuster shaft 15 via a link 37. A feed control operating pin is symmetrically carved on the adjustment cam body 28 and is disposed with one end facing inside the groove W where the forward feed control cam surface 29 and the reverse feed amount control cam surface 30 face each other. 34 is the cam groove 3 of the spring pressure switching cam body 32.
3, and when the dial 20 is in the range A, it moves rearward than shown in the figure, and when the dial 20 is in the range S, as shown in the figure, it moves to the front position as shown in the figure. An engagement pin 39 is tensioned through appropriate enlarged links 40 and 41 when the engagement pin 34 is in the illustrated position so as to press the operating pin 31 against the normal feed amount control cam surface 29. 36 is a spring that is fixed to the reverse sewing button shaft 36 and is arranged so that the tension is completely released when the dial 20 is in the range A. The end of the elongated hole 36' is a total backward control piece for moving the operating pin 31 in the direction of contact with the reverse feed amount control cam surface 30 as the shaft 35 is pressed.

As described above, in the sewing machine of the present invention, when the operation mode switching dial 20 is set to the A range, the needle hole becomes the zigzag needle hole 8', and the movement of the needle rod oscillating rod 12 and the movement of the feed control lever 38 are controlled respectively. The operation of the pulse motors 13 and 16 allows for free control, and the closing of the switch SW activates the electronic circuit, so that various patterns can be freely selected by operating the buttons 2, 3, etc. It is used as a so-called full-fledged electronic sewing machine that automatically performs stitching, and when the dial 20 is switched to the S range, first the electronic circuit is deenergized, then the needle bar is fixed at the straight sewing position, and then the straight sewing is started. The needle hole 9' is placed in the required position, and the feed adjuster spring 39 is sufficiently tensioned so that when the dial enters one end of the S range, the feed control actuating pin 31 moves to the above-mentioned normal position. Feed rate control cam surface 29
The pin 31 is pressed at one end, that is, the position that limits the normal feed amount to the maximum, and when the dial is further rotated toward the other end of the S range, the pin 31 controls the normal feed amount by the action of the cam surface 29. The pin 31 controls the reverse feed amount by symmetrically regulating the feed amount when the backward sewing button shaft 35 is pressed no matter where the dial 20 is in the S range. This is forced by the cam surface 30, that is, it can be used as a purely mechanical straight stitch sewing machine in which the normal feed amount can be manually adjusted as desired.

In the above embodiment, the adjustment of the feed amount by operating the dial 20 times in the S range and the reversal of the feed by operating the backward sewing button shaft 35 are performed while passively operating the pulse motor 16. If the motor, that is, the electric device 16 requires a certain amount of force due to the above-mentioned passive motion, and if this causes any inconvenience, remove the dial 20 from the A range and change the transmission relationship between the pulse motor 16 etc. and the feed regulator shaft 15. It is permissible to take appropriate measures to temporarily cut it off so that it can be restored.

In addition, when the sewing machine is in use as an electronic sewing machine, appropriate means for preventing the reverse button shaft 35 from being pressed may be provided, such as a mechanical device or an electromagnetic device that allows the shaft 35 to be pressed only at a specific phase of the dial 20. I can't help it. ．． The present invention is as described above, and an operating system switching dial device is provided in an electronic sewing machine so that simple straight green stitching can be performed purely mechanically by switching to an operating system that does not depend on an electronic circuit, thereby ensuring a straight stitch function. This invention provides a useful sewing machine with a unique configuration that saves power and is quiet during straight stitch operation.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is an external view of the sewing machine of the present invention, and FIG. 2 is an explanatory diagram of the mechanism of the sewing machine. In the figure, 20 is an operating member, 22 is a cam device that closes the electronic circuit switch, 23 is a cam device that fixes the needle comb support in the straight sewing position, and 28 is a device that generates the posture of the feed adjuster. A cam device 32 regulates the forward feed amount and reverse feed amount to change, and 32 is a cam device that changes the feed adjuster bias spring pressure from a released state to a tensioned state. Figure 1 Figure 2

Claims (1)

[Claims] 1 A sewing machine capable of performing various automatic pattern stitches while determining the needle bar lateral vibration position and feed adjuster posture for each stitch by an electric drive device based on commands from an electronic pattern generator. The above-mentioned sewing machine is equipped with an operating member that can be manually switched between an A range for performing the various automatic pattern stitches described above and an S range for performing straight stitches with the feed amount adjusted arbitrarily. The operating member includes a cam device that closes a switch of an electronic circuit for automatic pattern sewing when the operating member is in range A;
A lateral vibration fixed cam, a feed adjustment cam body, and a spring pressure switching cam body that are linked to the rotating operation of the operating member, and when the operating member is operated to select straight stitch, the needle bar swinging fixed piece is rotated. A lateral vibration fixing cam that engages the fixed piece with a crank pin of a pulse motor for lateral vibration control, and a forward and reverse feed cam surface that is rotated and symmetrically carved when the operating member is operated to select a straight stitch. A biasing member that presses against the normal feed cam surface a feed control actuating pin that controls the feed adjuster shaft, which has one end facing into the facing groove and is rotated by the feed control pulse motor during automatic pattern sewing. and a spring pressure switching cam body that acts on a spring, and when the operating member is operated to select straight stitch, the lateral vibration of the needle bar is stopped by fixing the crank pin, and the biasing spring action by the spring pressure switching cam body is provided. A sewing machine configured such that the feed control actuating pin is set to be in pressure contact with the normal feed cam at the same time.