JPS6142529Y2 - - Google Patents

Description

[Detailed description of the invention] This invention has a plurality of pattern cams interlocked with the upper shaft of the sewing machine in the sewing machine arm, and a swing frame attached to a shaft parallel to the pattern cams, and a cam that swings together with the swing frame. A contact element is mounted so as to be freely movable in the axial direction, and this cam contact element is moved by a selection mechanism to be pressed against an arbitrary pattern cam by spring pressure, and the needle bar mounting frame connected to the swing frame via a link is oscillated. In a zigzag sewing machine that sews a zigzag pattern by moving the sewing machine, a cloth feed control cam that moves in the axial direction is installed on the cam shaft to which the pattern cam is attached. This allows the so-called super pattern to be sewn using the fabric feed adjuster inside the machine, which includes zigzag stitches and automatic backward stitching.Compared to conventional mechanisms of this type, it is easy to sew with extremely light push-button operations. The purpose of the present invention is to provide a switching device that can switch to.

Embodiments of this invention will be described in detail below with reference to the accompanying drawings.

In FIG. 1, 1 is an upper shaft rotatably attached to a sewing machine arm 2, and 3 is a camshaft perpendicular to this upper shaft 1, which is rotated in conjunction with an interlocking mechanism such as a worm gear. A plurality of pattern cams 4 are fixed to a shaft 3.

Reference numeral 5 in FIG. 1 denotes a swing frame, and this frame 5 is attached to the sewing machine arm 2 by a shaft 6 parallel to the cam shaft 3, and a cam contactor 7 swings together with the swing frame 5.
The roller 8 at the tip of the contact 7 is brought into contact with the pattern cam 4 from below by spring pressure.

In Figures 1 and 2, 9 is the sewing machine arm 2.
A plurality of selection levers each having its rear end swingably mounted on a horizontal axis 10 near the top of the sewing machine arm 2, and a selection button exposed on the front part of the sewing machine arm 2 at the top of the tip of each lever 9. 11 is fixed.

Reference numeral 12 in FIG. 2 is a locking plate whose lower end is swingably attached to a horizontal axis 13 at the lower part of the front side of the group of selection levers 9. A locking hole 15 for locking the protruding piece 14 is provided for each lever 9, and a spring 16 is attached to each lever 9 to push it upward, and the locking plate 12 is provided with a spring 16 to push the spring upward. A spring (not shown) is attached to push it.

Reference numeral 17 in FIGS. 2 and 3 denotes a selection plate, the upper ends of which face forward on both sides are rotatably supported by the aforementioned shaft 10 attached to the sewing machine arm 2, and the front part of its lower end is A receiving portion 19 is provided on the lower rear side of each selection lever 9, with which the lower end rear side of the arm 18 comes into contact. This receiving part 1
As shown in FIG. 3, the levers 9 are arranged at different levels for each lever 9, and when each lever 9 rotates downward, its arm 18 pushes the receiving part 19 to move the selection plate 17 to an angle corresponding to each lever 9. It is designed to be tilted.
Further, this selection plate 17 is interlocked with the contactor 7 by an interlocking mechanism (not shown), and the selection button 11
When is pressed and the selection plate 17 moves, the roller 8 of the contact 7 comes into contact with the pattern cam 4 corresponding to the selection button 11 that was pressed.

Reference numeral 20 in FIGS. 3 and 5 is an automatic reverse sewing switching lever, and this lever 20 is rotatably attached at its rear end to the shaft 10 at one end of the group of selection levers 9. An elevating swing plate 21 is arranged on one side of this lever 20, and a switching button 22 is placed on the upper end thereof.
is fixed, and a pin 23 provided on one side near the upper end of the swing plate 21 is loosely fitted into a long hole 24 provided at the front of the lever 20, thereby imparting upward rotational force to the lever 20. A spring 25 is provided.

Reference numeral 26 in FIG. 4 is a swingable lever attached to the sewing machine arm 2 by a shaft 27, and its front end is attached to the shaft 28.
is connected to the lower end of the swing plate 21 by. Further, upper and lower engaging portions 29 and 30 are provided on the upper rear side of the swing plate 21, and a fixed plate 32 having a notch 31 for locking the engaging portions 29 and 30 is attached to the sewing machine arm 2.

Reference numeral 33 designates an operating lever disposed on the other side of the switching lever 20, and its rear end is rotatably attached to the shaft 10. Switching lever 2 of this lever 33
A pin 34 is provided on the side surface of the 0 side, and both levers 2
A common spring 35 is attached to the levers 0 and 33 to apply a downward rotational force to the lever 33 with respect to the lever 20.

36 is a cloth feed control cam push lever whose lower end is rotatably attached to the shaft 27. A cam pushing roller 37 is rotatably attached to a part of the side surface of this lever 36, and this roller 37 is brought into contact with the rear surface of the cloth feeding control cam 38 attached to the camshaft 3 near the outer periphery thereof.

The cam 38 is slidably fitted to the front part of the cam shaft 3 by a slide key as shown in FIG. 6, and is pushed rearward by a spring 66.
is always pressed against the roller 37.

Reference numeral 39 denotes an engagement/disengagement lever, the front end of which is connected to the upper end of the push lever 36 by a shaft 40. Further, a spring 41 is attached between both levers 36 and 39 to impart rearward upward rotational force to the lever 39, and the rear piece 42 of the lever 39 is mounted on a cam 43 fixed to the upper shaft 1 as shown in FIG. An engaging portion 44 that engages with a cam 43 is provided on the lower front side of the rear piece 42,
A cam portion is formed on the upper side portion and is continuous with a rising cam portion 67 and a descending cam portion 68 facing the pin 34 of the operating lever 33.

Further, a notch 46 is provided on the lower side of the front end of the operating lever 33 to engage with the protrusion 45 at the upper end of the push lever 36.

47 in FIGS. 1 and 2 is a contactor for the cloth feed control cam, and the shaft 48 connects the sewing machine arm to the center of the contactor.
The upper end is in contact with the front outer periphery of the cloth feed control cam 38. The shaft 48
The contactor 47 rotates together with a contactor 47, and the contactor 47 is fixed to one side of a suitable swing frame 49, and a downwardly directed arm 50 is fixed to the other side of this frame 49.

A swing box 51 having a standing wall on one side is arranged behind the arm 50 near the bottom, and its upper end is connected to a shaft 52.
The grooved roller 53 is attached to the sewing machine arm 2 so as to be able to swing freely by
A lever member 65 that operates in conjunction with an operating section (not shown) that allows the roller 53 to be freely operated from the outside of the sewing machine arm.
The roller 53 is held by a pin protruding from the side surface of the upper end of the box 51 side. Said box 51
A shaft 54 is made to protrude from the lower end of the other side.
is brought into contact with the rear side of the lower end of the arm 50.

Reference numeral 55 in FIGS. 1 and 2 is a transmission lever, whose middle portion is swingably attached to the sewing machine arm 2 via a shaft 56. The upper front edge 57 of this lever 55 engages with the circumferential groove of the grooved roller 53 from behind, and the roller 53 is always held between the vertical wall of the box 51. 58 is the shaft 5 below the lever 55.
The lower end of the transmission lever 55 is in contact with the rear side of the receiving piece 60 at the front of the upper end of the cloth feed adjustment box attached to the sewing machine arm 2 by 9. As is well known, the adjustment box 58 is linked to a horizontal feed mechanism (not shown) so as to adjust the stroke of the feed dog and its feed direction by changing the inclination angle, and is operated by a spring (not shown). A rotational force in the direction of the arrow in Figure 2 is applied.

In FIGS. 1 and 6, reference numeral 61 denotes a mounting base fixed within the sewing machine arm 2, and a swingable lever 62 is attached to the front part of this base 61, and this lever 62 is connected by a connecting rod 63. A connecting rod 64 connected to the swing frame 5 and also connected to the lever 62 by a shaft is connected to a needle bar mounting frame, which is not shown.

The shape of the cam 43 and its attachment to the upper shaft 1 are adjusted so that the cam 43 presses the engagement portion 44 of the engagement/disengagement lever 39 while the sewing machine needle (not shown) is above the top surface of the needle plate. do.

In the above embodiment, when sewing a normal zigzag pattern, the engaging portion 30 at the bottom of the swinging plate 21 is kept engaged with the notch 31 of the fixed plate 32, as shown in FIG. In this state, the automatic reverse sewing lever 20 is in the upper position, and together with it the operating lever 33
is also rising as shown by the chain line in Figure 7. Therefore, the engagement/disengagement lever 39 is also raised as shown by the chain line in the figure, and its engagement portion 44 is outside the range of rotation of the cam 43 of the upper shaft 1.

In this state, the cloth feed control cam 38 is in the retracted position as shown by the chain line in FIG. 2 due to the spring 66 in FIG.
The automatic backward sewing mechanism is inoperative.

In this state, when any selection button 11 shown in FIGS. 1 and 2 is pressed and the selection lever 9 integrated therewith is turned downward, the protrusion 14 locks into the locking hole 15 of the locking plate 12. At the same time, the arm 18 pushes the receiving part 19 and rotates the selection plate 17 backward by a predetermined angle, so that the selection mechanism interlocked with this through an appropriate interlocking mechanism moves the contactor 7 and moves the roller 8 to a desired position. It is brought into contact with the pattern cam 4.

When the sewing machine is operated in this state, the pattern cam 4 causes the contact 7 and the swing frame 5 to swing, and this swing is transmitted to the needle bar mounting frame via the connecting rods 63 and 64, thereby sewing a zigzag pattern.

Next, when you press the other selection button 11, the protrusion 1
4 presses the locking plate 12 to remove the protrusion 14 that was previously fitted into the engagement hole 15 and return it, and the protrusion 14 corresponding to the selection button 11 that was just pressed engages with the locking hole 15. A new pattern cam 4 is selected.

Next, when the switching button 22 in the position shown in FIG. 4 is pressed down, the vertically swinging plate 21 is lowered, the engaging portion 29 on the upper part thereof is engaged with the notch 31, and at the same time, the switching lever 20 is lowered. Therefore, the operating lever 33 also moves down to the position shown by the solid line in FIG. 7 via the spring 35, so that the pin 34 on the side of the lever 33
The engaging portion 44 is lowered to the position shown by the solid line in FIG. 7 against the spring 41 which abuts against the rising cam portion 67 of 9 and urges upward, and the engaging portion 44 is placed within the range of rotation of the cam 43. At this time, if the protrusion of the cam 43 faces toward the engagement/disengagement lever 39 and the cam 43 prevents the levers 33 and 39 from being pressed down, only the spring 35 is bent and the upper shaft 1 is bent as described later. When the protrusion of the cam 43 comes off the engagement/disengagement lever 39 as it starts to rotate, the levers 33,3
9 is pressed down by a spring 35.

Thereafter, when the upper shaft 1 begins to rotate in the direction of the arrow in FIG.
As shown in FIG.
, the lever 39 begins to tilt forward as shown by the arrow, and at the same time, the pin 34 that is in contact with the rising cam portion 67 of the engagement/disengagement lever 39 moves along the inclined surface of the cam portion, so that the operating lever 33 is slightly tilted. When the cam 43 on the upper shaft rotates upward and tilts to a position where the protruding piece 45 at the upper end of the push lever 36 enters below the notch 46 of the operating lever 33, the pin 3
4 comes off from the cam portion 67 and is located on the lowering cam portion 68 side, and at this time the operating lever 33
Since the lever 33 is urged downward by the spring 35, the notch 46 of the lever 33 engages with the protrusion 45 at the upper end of the push lever 36.

As the cam 43 rotates, the lever 39 is pushed a little further, but the protruding piece 45 is pushed into the notch 46 as shown in FIG.
When the cam 43 is disengaged from the engagement portion 44 of the lever 39, the engagement portion 44 is completely disengaged from the rotation range of the cam 43 by the action of the spring 41 as shown in FIG.

Further, as described above, the engagement/disengagement lever 39 is connected to the cam 43.
At the same time, the push lever 36 rotates forward, and the roller 37 pushes the cloth feed control cam 38 forward against the spring 66, as shown by the solid line in FIG. Therefore, the unevenness around the front surface of the cam 38 causes the cam contactor 47 to swing, so the swinging frame 49 and the arm 50 that are integral with the cam contactor 47 swing, and the arm 5
Since the lower end of 0 pushes the shaft 54 of the swinging box 51, the swinging box 51 swings around the shaft 52. When the swinging box 51 swings in this manner, the roller 53 pushes the upper front edge 57 of the transmission lever 55 to swing it, and its lower end pushes the receiving piece 60, causing the cloth feed adjustment box 5 to swing.
8 to control the feed dog so as to correspond to the unevenness of the cam 38, and sew a so-called super pattern in which automatic backward stitching is added to the zigzag pattern selected by the selection button 11.

After sewing the desired super pattern in this manner, when the switching button 22 is pulled forward to remove the upper engaging portion 29 from the notch 31 of the fixed plate 32, the swinging plate 21 is raised by the spring to the position shown in FIG. Return to At the same time, the switching lever 20 and the operating lever 33 are also returned to their original positions, the protruding piece 45 is removed from the notch 46 of the operating lever 33, and the operating lever 33 and the engagement lever 39 are returned to the positions indicated by the chain lines in FIG. Therefore, even if the cam 43 of the upper shaft 1 rotates, the lever 39 becomes irrelevant and the automatic backward sewing mechanism becomes inactive.

This invention is based on the above-mentioned zigzag sewing machine, when the upper shaft 1 of the sewing machine starts rotating after pressing down the switching button 22 provided on the sewing machine arm 2, the cloth feed control cam 38 provided on the cam shaft 3 moves forward to remove the cloth. The cloth feed adjustment box 58 is automatically swung by contact with the feed control cam contact 47 and the swing of this contact 47, but especially in the case of this invention, the pressing of the switching button 22 is The automatic reverse stitching switching lever 20 connected to the automatic reverse stitching switching lever 20 only resists the light spring 25, and the force for pressing the heaviest cam 38 onto the contactor 47 is generated by the rotation of the upper shaft 1 of the cam 43.
This has the advantage that the switching button 22 can be pressed with extremely light force. In addition, if the fabric feed adjustment box moves while the sewing machine needle is inserted into the needle hole of the fabric or throat plate, the needle may bend or break, causing problems in subsequent sewing. By timing the vertical movement of the needle bar and the start of automatic backward sewing by the cam 43, the fabric feed adjustment box does not move unless the sewing machine needle is on the top surface of the throat plate, making it safe. effective.

[Brief explanation of the drawing]

Figure 1 is a front view showing the internal structure of the main part of the sewing machine that has implemented this invention, Figure 2 is a partially longitudinal side view of the same as above, Figure 3 is a plan view of the same, and Figure 4 is the vicinity of the automatic reverse stitch switching lever. FIG. 5 is an exploded perspective view of the main parts, FIG. 6 is an exploded perspective view of the pattern cam, and FIGS. 7 to 11 are enlarged views of each state to explain the operation of this invented device. FIG. DESCRIPTION OF SYMBOLS 1...Sewing machine upper shaft, 4...Pattern cam, 7...Cam contactor, 9...Selection lever, 20...Automatic reverse sewing switching lever, 21...Elevating swing plate, 33...Operating lever, 35 ... Spring, 36 ... Cloth feed control cam pushing lever, 38 ... Cloth feed control cam, 39 ...
...disengagement lever, 41...spring, 44...engaging portion,
47... Contact for cloth feed control cam, 58... Cloth feed adjustment box.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A cam shaft having a plurality of pattern cams that rotates in conjunction with the upper shaft of the sewing machine, a cam contactor that swings in contact with the pattern cam, and a cam contactor that swings in contact with the pattern cam; a pattern selection mechanism that brings the pattern into contact with any pattern cam;
In a zigzag sewing machine, the zigzag sewing machine includes a transmission mechanism that transmits the swinging motion of the cam contactor to the needle bar mounting frame, and a cloth feed adjustment box that controls the stroke and feed direction of the feed dog of the sewing machine. A cloth feed control cam that rotates with the shaft and is pushed backwards by a spring and can move forward and backward is installed, and in front of this cam is a cloth feed control that contacts and swings the cam to swing the cloth feed adjustment box. A cam contact is provided, and on the side of the cloth feed control cam, a rocker is provided that presses the cloth feed control cam to the contact when tilted forward, and releases the contact from the cam when tilted backward. A freely movable cloth feed control cam pushing lever is provided, and a part of this pushing lever has a front part of a locking/disengaging lever that is pushed forward by a cam fixed to the upper shaft of the sewing machine and tilts the pushing lever forward. It is attached to a part of the sewing machine arm so that it can swing freely, and when pushed toward the upper shaft, the lever is placed within the rotation range of the cam of the upper shaft, and when it is restored, the lever is moved out of the rotation range of the cam. A zigzag pattern sewing switching device including automatic backward sewing, characterized in that it is provided with an operating lever. (2) Registration of a utility model characterized in that the cam on the upper shaft is formed in a shape that pushes the engagement/disengagement lever only while the sewing machine needle attached to the needle bar is positioned above the top surface of the throat plate. A zigzag pattern sewing switching device including automatic backward sewing according to claim 1. (3) The automatic vehicle according to claim 1 of the utility model registration, characterized in that a spring is provided between the engagement and disengagement lever and the push lever so as to always bias the engagement and disengagement lever in one direction. Zigzag pattern sewing switching device including backward sewing. (4) The automatic reversing device according to claim 1 of the utility model registration, characterized in that the operating lever is provided with a locking portion that prevents the pushing lever from returning to its original state when the pushing lever is tilted forward. Zigzag pattern sewing switching device including sewing.