JPS62604Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field) The present invention relates to a tacking mechanism for sewing buttonholes in a sewing machine, and in particular includes a sewing pattern selection mechanism and amplitude control for controlling the amplitude of the sewing pattern selected by the mechanism. The present invention relates to a tacking mechanism for sewing buttonholes of a sewing machine, which has a member added with a mechanism having a simple structure that acts on the sewing pattern selection mechanism.

(Objective) It is an object of the present invention to provide an amplitude control member that includes a sewing pattern selection mechanism and controls the amplitude of the sewing pattern selected by the mechanism, and a mechanism that has a simple structure that acts on the sewing pattern selection mechanism. By adding this, it is possible to perform fastening stitches for buttonhole sewing with extremely good operability by one-touch operation of the amplitude control member.

(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 as a feed control member and an amplitude dial 5 as an amplitude control member are provided.

To explain these in detail, the buttons 2 for selecting various sewing patterns and the buttons 2', 2'', 2 for selecting buttons related to buttonhole sewing are fixed to the holder 6 and the holders 6', 6'', 6, respectively. ing. Hereinafter, these buttons and holders will be represented by 2 and 6 unless there is a particular need to distinguish between them. Each holder 6 has a shaft 8 fixed to the machine frame 7.
a plurality of collars 9 and a plurality of rings 1;
The left and right positions in the figure are regulated by rings 11, E-links 12, etc., which are arranged at intervals as shown in FIG. 2 and fixed to the shaft 8. Although other "shafts" will be mentioned in the explanation below, it is assumed that each shaft is fixed to the machine frame 7 unless otherwise specified.

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 13 is locked to each holder 6, and the other end is locked to the shaft 14. Normally, the lower surface of the notch 6b formed in each holder 6 is connected to the shaft 14. The cushion member 15 has a plurality of regulating pieces 15a that regulate the position of each holder 6 in the thickness direction. The holder receiver 16, which is a holding member, is attached to the shaft 1.
7 in the clockwise direction in FIG. Rotate the holder receiver 16 counterclockwise, and as shown in FIG.
returns clockwise, and as shown in Figure 6, protrusion 1
The lower surface of the locking portion 6a locks the upper surface of the locking portion 6c, and the button 2 enters the selected state. The feed switching arm 18 is pivotally connected to the shaft 17, and the feed switching arm has horn portions 19a and 1.
A member 19 with 9b is fixed to the holders 6'' and 6 of the button 2'' for the bar tack for buttonhole sewing and the button 2 for the left line tack, respectively.
The feed switching arm is located below pin 1.
8a, a feed lever 22 pivotally connected to a pin 21a of the base plate 21 via a rod 20 as shown in FIG.
The feed switching plate 2 is pivotally connected to a pin portion 22a of the feed lever, and the other end of the feed lever is guided around the middle by a pin 21b fixed to the base plate 21, and is moved linearly.
3 via a pin 23a, the feed switching plate moves the horizontal feed cam 24 along a lower shaft 25 as described later, and switches the horizontal feed cam to a forward position, a neutral position, and a reverse position.

The horizontal feed cam 24 is formed with locking structures having different rotational phases at both ends, and is fitted to the lower shaft 25 so as to be slidable and rotatable. An engaging body 26 for forward movement and an engaging body 27 for backward movement are sandwiched between lower shaft 25.
These engaging bodies are each formed with a protrusion 26a and a protrusion 27a that engage with the groove. Further, the horizontal feed cam 24 is biased to the left in FIG. 7 by the spring 28 via the spring receiver 29, and is normally engaged with the engaging body 26 to be in a forward feeding state. A feed base equipped with feed teeth (not shown) is engaged with the vertical feed cam 24, and the feed base is moved horizontally and is also vertically fed by a vertical feed mechanism (not shown), and both feed movements are combined. Performs a so-called four-feed motion. When sewing buttonholes, when button 2'' for bartack sewing is selected, the corner 19a is pushed by the holder 6'', so the feed switching arm 18 rotates clockwise around the shaft 17, and the rod 20 and the feed lever 22 and the feed switching plate 23, the horizontal feed cam 24 is moved to the left in FIG. 7 along the lower shaft 25, and as shown in FIG.
and the engaging body 27 are in a disengaged state,
Horizontal feed motion is not transmitted to the feed base. When the button 2 for left line tack sewing is selected, the holder 6 pushes the corner 19b, and the feed switching arm 18 rotates around the shaft 17 by a larger angle clockwise than in the case of bar tack sewing. The horizontal feed cam 24 engages with the engaging body 27, and the feed base is configured to be fed backward at a pitch substantially equal to the forward feed amount for right line tuck stitching.

A follower 30 is pivotally attached to each holder 6,
When the button 2 is selected, one end is driven by a patterned cam 33 that is integrally fixed to the gear 31 and pivoted to a shaft 32, and the other end is brought into contact with a shaft 35 fixed to a claw plate 34. It is composed of
The output end 34a of the pawl plate 34 is connected to a link mechanism that swings the needle bar in the amplitude direction, and the pawl plate 34 is biased clockwise in FIG. 4 about the shaft 8 by the link mechanism. As shown in FIG. 9, a pin member 38 is fixed to an amplitude limiting arm 37 that is pivotally connected to the shaft 8 and is controlled by the amplitude control cam 5a of the amplitude dial 5 brought into contact by the biasing force of the spring 36.
This restricts clockwise rotation. A pin 16c protrudes from the holder receiver 16 as shown in FIG.
When the amplitude dial is rotated by the cam 56 formed in the cam 56 beyond the amplitude adjustment range to the tacking position as described later, the holder receiver 16 is rotated counterclockwise as shown in FIG. , the holder 6 of the button 2, which was locked to the holder receiver 16, is released.

A pin 39 protrudes from the machine frame 7, and arms 40a and 40b of a torsion coil spring 40 loosely fitted to the boss portion 5c of the amplitude dial 5 act to sandwich the pin from both sides, thereby providing elasticity. Target locking part 4
1, and when the amplitude dial is rotated counterclockwise in FIG.
A protrusion 5d, which is a locking portion formed in the bottom, is locked.
This locking position is the first locking position with the maximum amplitude, and in this embodiment buttonhole sewing is performed at this locking position. When the pin 39 is rotated from the first locking position against the biasing force of the spring 40, it can be rotated to the second locking position where the locking portion 5e of the amplitude dial 5 contacts the pin 39. In this example, the tacking for buttonhole sewing is performed at this locking position. In this second locking position, the button 2 that had been selected as described above becomes a non-selected state as the holder 6 is unlocked, and the button 2 that is extended to the cam 5a formed on the amplitude dial 5 is in a non-selected state. The amplitude limiting arm 37 is actuated by the cam portion 5a', and the amplitude of the needle bar is limited so that the needle drop is slightly inward than the maximum amplitude for buttonhole sewing. When the operating force is released at this second locking position, the amplitude dial 5 returns to the first locking position due to the biasing force of the spring 40.

(Function) Next, the function of the present invention configured as described above will be explained. First, in order to sew buttonholes, set the feed amount to a value suitable for sewing buttonholes using the feed dial 4, and turn the amplitude dial 5 over the spring 40 whose protrusion 5d constitutes the elastic locking portion 41.
When the button 2' is rotated to the first locking position where it is locked to the arm 40a of are selected in this order, and the right line tack L ₁ , lower bar tack B ₁ , left line tack L ₂ and upper bar tack B ₂ are sewn as shown in FIG. The tacking stitch for buttonhole sewing after sewing the upper bar tack _B2 can be performed by one-touch operation of the swing width control member 5. That is, after the upward bar tuck _B2 is completed, the amplitude dial 5 is moved from the first locking position to the second locking position where the locking portion 5e of the amplitude dial 5 contacts the pin 39 against the biasing force of the spring 40. When the holder receiver 16 is rotated and held, the holder receiver 16 is rotated counterclockwise by the cam 5b, and the bar-touch button 2'' that is locked to the holder receiver 16 is released, and at the same time, the cam portion 5a' As a result, the amplitude limiting arm 37 is actuated, and the pin member 38 limits the rotational position of the claw plate 34 in the clockwise direction in FIG. As a result of this operation, the lock stitch FU is performed in a straight line with the same sewing pitch as the right line tack L _1.After the lock stitch is completed, when the operating force on the operation dial 5 is released, the operation dial moves to the protrusion 5d.
11 by the biasing force of the spring 40, and returns to the first locking position as shown in FIG. 9, allowing selection of the sewing pattern button 2.

(Effects) As described above, according to the present invention, the amplitude control member that includes the sewing pattern selection mechanism and controls the amplitude of the sewing pattern selected by the mechanism has a simple structure that acts on the sewing pattern selection mechanism. By adding a mechanism, an effect can be obtained in that buttonhole stitching can be performed with extremely good operability by one-touch operation of the amplitude control member.

[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 cross section of the main part taken along the line C-C 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. 7 and 8 are views showing the main parts of the horizontal feed cam switching mechanism in the direction of arrow D in FIG.
The figure shows the forward feeding state, and FIG. 8 shows the horizontal feeding cam in the inactive state. 9 shows the state of the main mechanism at the first locking position of the amplitude dial in the direction of arrow A in FIG. 2. FIG. 10 shows the cam parts and related members of the amplitude dial in the same state as in FIG. 9. FIG. 11 is a diagram showing the state of the main mechanism at the second locking position of the amplitude dial in the direction of arrow A in FIG. 2, and FIG. 12 is a diagram showing the state of the amplitude dial in the same state as in FIG. A diagram showing the relationship between each cam part and related members, and FIG. 13 is a plan view showing a buttonhole seam. In the figure, 2 is a sewing pattern selection button, 3 is a sewing pattern selection mechanism, 5 is an amplitude control member, 5a is a cam for amplitude control, 5a', 5b are cam parts, 5d is a locking part, 16
37 is an amplitude limiting arm, and 41 is an elastic locking portion.

Claims (1)

[Scope of utility model registration request] It is equipped with a sewing pattern selection mechanism that selects a sewing pattern by locking a button for selecting a plurality of sewing patterns including buttonhole sewing with a holding member when the button is operated, and an amplitude limiting arm that controls the amplitude of the sewing pattern selected by the mechanism. The amplitude control member controlled via the sewing pattern selection mechanism contacts an elastic locking portion provided in the sewing pattern selection mechanism at a first locking position, and the amplitude control member is rotated to a second locking position. a locking portion that is biased by the elastic locking portion in a direction to return the amplitude control member to the first locking position when the amplitude control member is operated to the second locking position; a cam portion that acts on the member to release the lock of an already selected button; and a second cam portion of the amplitude control member that extends to the amplitude control cam that acts on the amplitude limiting arm during amplitude control by the amplitude control member. A cam part for controlling the needle drop to a position within the amplitude range of the buttonhole sewing bar tack when the buttonhole sewing machine is operated to the locking position.