JPS62603Y2 - - Google Patents

Description

[Detailed description of the invention] (Technical field) The present invention relates to a button selection mechanism for selecting a sewing pattern on a sewing machine.In particular, the push button operation force is light and the selection can be made reliably. The present invention relates to a button selection mechanism for a sewing machine configured to reduce the size of the button.

(Prior Art) Conventionally, a button selection mechanism for selecting a sewing pattern on a sewing machine requires a holding device to keep the selected button in that state. This is done by holding the fixed operating member. When the button is pressed, the holder is moved to a position where it releases the holding state, and then returns to the position where it is held again. This actuation is necessary to deselect the already selected button. In this operation, the holder is moved in the direction to release the holding state by the operating force of the button, but the holder is returned to the held direction by the spring force. Therefore, in the conventional example, if the holder malfunctions due to dust adhering to the moving surface of the holder, it may not be possible to maintain the selected state even if the button is operated. In order to solve this problem, it was considered to increase the spring force that biases the holder, but this method has the disadvantage that button operation becomes difficult, and the holder It also became necessary to increase the rigidity of the Furthermore, with the conventional button selection mechanism, the needle may be moved outside the maximum amplitude range depending on the phase of the pattern cam due to the extra stroke for locking the button when the button is selected. It was also necessary to spread it out, which was inconvenient for sewing.

(Purpose) The purpose of the present invention is to reduce the operating force during the selection operation by making the biasing force of the spring of the holder that locks the button holder weak or unnecessary in the push button type selection mechanism of the sewing machine. To make it lighter, to enable reliable selection, and to reduce the amount of extra movement of the needle drop caused by an extra stroke when selecting a push button.

(Structure) The structure of the present invention will be explained below using examples. In FIG. 1, a sewing machine 1 is provided with a plurality of sewing pattern selection buttons 2 including buttonhole sewing at the lower front of the sewing machine 1, and a sewing pattern selection mechanism 3 that selects a sewing pattern by locking these buttons 2 when the buttons 2 are operated; A feed dial 4 and an amplitude dial 5 are provided.

To explain these in detail, the buttons 2 for selecting various sewing patterns are each attached to a holder 6 which is an operating member.
is fixed to. Each holder 6 is pivotally connected to a first shaft 8 fixed to a machine frame 7, and arranged at intervals as shown in FIG. From now on, other "axes" will appear in the explanation, but unless otherwise specified, each axis is machine frame 7.
It shall be fixed to.

Next, referring mainly to FIGS. 4 to 6, each holder 6 is rotated clockwise in FIG. energized. That is, one end of each torsion coil spring 9 is locked to each holder 6, and the other end is locked to the shaft 10, and the lower surface of the notch 6b formed in each holder 6 is normally connected to the shaft 10. A plurality of regulating pieces 1 are attached and regulate the position of each holder 6 in the thickness direction.
1a is in contact with the lower surface of the cushion member 11. The holder receiver 12, which is a locking member, is pivotally attached to a second shaft 13, and in this embodiment, it is biased clockwise in FIG. 4 by a weak spring 14 around the shaft 13. When the holder 6 rotates counterclockwise in the same figure, the lower surface of the locking part 6c rotates the holder receiver 12 counterclockwise via the protrusion 12a, and after this rotation, it moves downward as shown in FIG. The end portion 6d is brought into contact with the locking protrusion 12b,
When the holder 6 is further pushed in in this state, the lower end 6d is inserted into the holder receiver 12 via the locking protrusion 12b.
Since it urges clockwise around the shaft 13,
The upper surface of the locking portion 6c is configured to fit into the lower surface of the protrusion 12a so that the holder 6 is locked to the holder receiver 12 when the operating force of the button is released. A follower 15 is pivotally attached to each holder 6, and when the button 2 is selected, one end is driven by a pattern cam 18 which is integrally fixed to the gear 16 and pivoted to the shaft 17, and the other end is driven by a claw plate. 19 is configured to abut against a shaft 20 fixed to the shaft 19. The output end 19a of the pawl plate 19 is connected to a link mechanism that swings the needle bar in the amplitude direction, and the pawl plate swings around the shaft 8 by a spring (not shown) that biases the needle bar toward the right base line. It is biased clockwise in FIG. 4 and is locked in the position shown in the figure by an amplitude limiting arm (not shown). The relationship between the peaks and valleys of the cam and the needle bar position when selecting a pattern cam is that if, for example, a zigzag cam is selected among the pattern cams and the amplitude is set to maximum, the needle bar position will change when the follower follows the peak of the cam. is in the left baseline position and in the right baseline position when following the cam valley.

(Function) Next, the function of the present invention configured as described above will be explained. Button 2 to select sewing pattern
When pressed, the holder 6 rotates counterclockwise in FIG. 4, and the lower surface of the locking part 6c rotates the holder receiver 12 counterclockwise via the protrusion 12a. As shown, the lower end 6d is brought into contact with the locking protrusion 12b, and in this state, the holder 6
When pushed in further, the lower end 6d engages with the locking protrusion 12b.
Since the holder receiver 12 is biased clockwise around the shaft 13 through and becomes selected. If you press another button 2 that has not yet been selected from the selected state shown in Figure 6, the already selected button 2 will be unlocked, and the newly operated button 2 will be locked in the same process as above. and becomes selected.

In the process of the above-described operation, the holder receiver 12 is urged by the lower end 6d of the holder 6 via the locking protrusion 12b in a direction in which the protrusion 12a locks the locking part 6c, and the protrusion 12a locks the locking part 6c. To lock, when the button 2 is released, the protrusion 12a engages the locking portion 6c.
Since the spring 14 only needs to be located above, the biasing force of the spring 14 only needs to be weak.If the position of the shaft 13 is moved so that the holder receiver 12 does not receive a counterclockwise moment about the shaft 13, the spring 14 can be biased. 14 becomes unnecessary.

Further, according to the present invention, the gap G necessary for engaging and disengaging the holder receiver 12 from the holder 6 can be minimized because the holder receiver 12 and the holder 6 are each formed integrally. Therefore, the amount of extra movement of the needle drop due to extra strokes when selecting a pattern can be minimized. This means that even if the follower is driven by the cam peak when selecting a pattern with the maximum amplitude set, the amount of movement of the needle bar further to the left from the left baseline position can be minimized. It is something.

(Effects) As described above, the present invention makes the biasing force of the spring of the holder that locks the button holder weak or unnecessary in a push button type selection mechanism of a sewing machine, thereby reducing the operating force during selection operation. This also provides the effect that the selection can be made reliably. Further, since the amount of extra movement of the needle drop caused by the extra stroke during the selection operation of the push button can be reduced, the width of the needle hole can be kept to the necessary minimum.

[Brief explanation of the drawing]

The drawings relate to an embodiment of the present invention, and FIG. 1 is a perspective view of the sewing machine, FIG. 2 is a plan view of the main part of the sewing pattern selection mechanism, FIG. 3 is a view taken from arrow A in FIG. 2, and FIG. 6th
The figure is a vertical section of the main part taken along the line B-B in Figure 2.
The figure shows the button in a non-selected state, FIG. 5 shows the button in the middle of the button selection operation, and FIG. 6 shows the button after the button selection operation. 1 is a sewing machine, 2 is a button, 6 is a holder as an operating member, 6c is a locking part, 6d is a lower end, 7 is a machine frame, 8 is a first shaft, 12 is a holder receiver as a locking member, 12a is a holder 12b is a locking projection, 13 is a second shaft, 15 is a follower, and 18 is a pattern cam.

Claims (1)

[Scope of utility model claims] It is rotatably supported by a first shaft fixed to the sewing machine frame, a pattern selection button is fixed to the upper end, a follower that engages the pattern cam during selection operation is pivotally mounted, and a locking part is provided at the end. and a second shaft fixed to the sewing machine frame, which is swingably supported and separated from the operating member when pressed by the locking portion of the operating member during downward operation of the operating member. In the push-button selection mechanism, the locking member is provided with a locking member formed with a protrusion having an inclined portion formed therein, and when the lower end of the operating member comes into contact with the locking member, the locking member is operated as described above. A button selection mechanism for a sewing machine, characterized in that a locking protrusion for rotation is provided on a member side.