JPS5824150B2 - Sewing machine pattern selection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pattern stitch selection device for a sewing machine,
In particular, the present invention relates to a device that selects various sewing patterns using an electrical seven-drive system.

An object of the present invention is to provide a plurality of cam followers that engage with a pattern sewing cam and transmit data stored in the cam to a moving part of the terminal, such as a needle bar support mechanism or cloth feeding mechanism that performs a swinging motion, by taking out data stored in the cam. The purpose is to make the lock body compact by allowing it to be arranged close to each other in a limited space, and another purpose is to engage and lock the lock body with the said followers, which are arranged and supported in large numbers in a narrow space. The goal is to ensure that the movement is transmitted to the needle bar or the terminal movement mechanism for feeding.

Next, to explain the structure of an embodiment of the present invention, a main shaft 24 is rotatably supported on an arm frame 100 of a sewing machine, and a worm 101 and a bush 27 are mounted on the main shaft.
is fixed to the worm 101, and a worm wheel (not shown) fixed to the pattern cam shaft 103 is engaged with a pattern cam shaft 103 rotatably supported on a unit mechanism stand 102 fixed in the arm machine frame. A belt pulley 23 to which a gear 104 is integrally fixed is formed on the outer periphery of the bush 27, a clutch engagement/disengagement cam 26 is formed on the outer periphery of the end portion, and a stopper engaging portion 29 and an inclined retaining portion 30 are formed on the side surface of the other end. The stop cam 31 is loosely fitted, and the belt pulley 23
A clip belt 5 driven by a drive motor (not shown) is hung around the outer periphery of the clip belt 5, and the clip belt 5 is normally engaged with a step 105 provided on the bush 27 by the action of a spring 106 on the side surface. Belt wheel 23 is bush 2
7, that is, a clutch arm 25 which is rotated integrally with the main shaft 24 is pivotally attached.

Furthermore, a coil spring 28 is attached to the main shaft 24, one end of which is fixed to the bushing 27, and the other end of which is fixed to the partial dog notch 105 of the stop cam 31, which is loosely fitted around the outer periphery of the bushing. The attached large screw 107 prevents it from falling off in the axial direction, and one end of the stop cam 31 is attached to the outer periphery of the inner shaft.
The wheel 108 is loosely fitted.

On the pattern cam shaft 103, a pattern cam 1 for sewing various patterns displayed on a panel 109 outside the machine frame, an automatic feed cam 116, etc. are stacked so that they can rotate together with the worm 101. , one end of a cam follower 2 provided for each pattern cam is engaged with and disengaged from each pattern cam 1, and the cam follower is connected to the unit mechanism base 102.
The other end 2-1 has two protruding arms parallel to a swing arm 111 rotatably supported on the follower shaft 110. 1st arm 11
The tail end 6 of a locking body 63 is pivotally connected to a fixed shaft 113 between two parts.
3-1, and one end of the locking body is connected to the selection cam shaft 11 fixed to the mechanism base 102.
5, the selection cam 4 is fitted so as to be rotatable.

A second arm 117 of the swing arm body 111 is connected to an end of a horizontal plate body 119 pivotally mounted 121 to the mechanism stand 102 so as to be swingable.

The arcuate wall 120 of the horizontal plate has a short shaft 123 attached to one end of a swinging rod 122, the other end of which is connected to a needle bar support (not shown) that supports and swings the needle bar. are pressed together by spring action.

Also, one end of the cam follower 2 is adapted to be engaged with and disengaged from the automatic feed cam 116 (see FIG. 1), and the other end 2-1 is connected to a feed swing rotatably supported by the follower shaft 110. The shape is such that it can be locked with the tail end 63-1 of the locking body 63 which is pivotally connected to the shaft 113 fixed to the arm 125 of the movable arm body 125, and one end of the locking body is connected to the selection cam shaft. The rod 125 is connected at its lower end to a rod 124 connected to a feed adjuster (not shown).

The follower shaft 110 further includes the feed swing arm 125.
Each tail end 63 of two locking bodies 63 pivotally attached to the arm 125 of
Two rocking bodies 140 each having a tail end 2-1 shaped so as to be lockable with each other are fitted adjacently to each other, and the ends of the rocking bodies have a tail end 2-1 fixed to the mechanism base 102. Release camshaft 126
A locking body that is connected via a rod 128 to the end of the follower 12 which is pivoted 127 so that one end engages with the manual operation cam 16 fitted in the cam 16 for manual operation, and that engages with the rocking body 140. Reference numeral 63 is adapted to be engaged with the switching cam 18 fitted to the selection camshaft 115 as an automatic AUTO.

For manual use, it is adapted to be engaged across the switching cam 18 and the selection cam 4.

(See Figure 8). Further, a claw body 143 having a short claw 141 and a long claw 142 is rotatably supported on the follower shaft 110 (see FIG. 9), and the short claw rotates on the selection cam shaft 115. A swinging width locking arm 145 is engaged with a switching cam 19 that is fitted in the same manner as shown in FIG. This locks the follower 146 that engages with the swing width limiting cam 49-2 through the cam 49-2.

A swing cam 88 is rotatably fitted onto the swing cam shaft 130 fixed to the mechanism base 102, and the cam is connected to a coaxial gear 131 that meshes with a gear 104 integrated with the belt wheel 23. (See FIG. 6) which is rotated via a bevel gear 132 and a bevel gear 133 meshing with the bevel gear.

The swing cam 88 has swing arms 91-1, 91-2, and 91 rotatably supported by a shaft portion 134 fixed to the mechanism base 102.
-3 are engaged with each other, the first other end 135 of the swing arm 91-1 is connected to the solenoid 7 so that it can be actuated by the drive of the solenoid 7, and the second At the end 136 is a shaft 12 fixed to the mechanism base 102.
A ratchet wheel 89-1 integrated with a switching cam 20 that can rotate on top of the switching cam 20
A pawl 90-1 for locking the tip pawl is pivotally supported.

Further, the first other end 135 of the swinging arm 91-2 is connected to the solenoid 8 so that it can be actuated by the drive of the solenoid 8, and the second other end 136 of the arm 91-2 has a rotatable member that rotates on the shaft 129. A pawl 90-2 for locking the tip pawl is pivotally supported on a pawl wheel 89-2 that is integral with the cam switch 10, and a first other end 137 of the swinging arm 91-3 is provided with a pawl 90-2 for driving the solenoid 6. The release cam 3 is connected to a long groove 139 provided at the end of the link connecting the solenoid so that it can be operated freely by the release cam shaft 126, and the second other end 138 has a release cam 3 rotatable on the release cam shaft 126. A pawl 90-3 that locks the tip pawl is pivotally supported on a pawl wheel 89-3 that is integrated with the pawl 89-3.

A switch 80 connected to each of the solenoids 6, 7, 8 and operated to be energized when any of the solenoids is driven.
(See Figure 10).

The present invention has the above-described structure, and its functions are explained below. First, the sewing machine is connected to a power source by operating the power button, and then the automatic or manual selection operation is performed, and the desired pattern sewing button is operated. When the electric motor controller is pressed, the sewing machine starts operating to sew the desired pattern.

That is, when a pattern sewing button is operated, a selection switch specific to that button is closed and the solenoid 6 is first driven.

When the solenoid is driven once, the switch 80 is closed and the electric motor is energized, so that the belt pulley 23 can be rotated at a low speed without operating the controller.

At this time, the main shaft 24 is maintained in a state in which the main shaft 24 is locked at a constant phase by a stopping device driven by the solenoid 9 and is not allowed to rotate.

When the belt pulley 23 rotates, the swing cam 88 is rotated, so that the swing arm 9 is rotated by one drive of the solenoid 6.
1-3 engages with the swinging cam 88 and is caused to swing, the pawl 90-3 turns the windmill 89-3, rotates the release cam 3, and releases the cam follower from the cam.

The rotation of the release cam 3 rotates the rotary switch 10-1, changing the circuit, cutting off the current to the solenoid, and stopping the swinging of the swinging arm.

Subsequently, when the solenoid T is driven, the pawl 90-1 is driven and the windmill 89-1 and the switching cams 20, 18, 19 are rotated, and then the solenoid 8 is driven and the selection cam 4 is rotated.
is rotated and stopped at the angular position of the birth chamber i, and the locking body 63 corresponding to the pattern cam 1 to perform the desired pattern sewing is swung by the selection force 4 and locked with the cam follower 2. to go into.

To explain this locking relationship in more detail, the cam follower 2 and the locking body 6
3 and 3 are both rotatably supported in the same plane, and the tip of the lock body is brought into contact with the peak of the selection cam 4 so that in the non-selected state, the lock body is placed outside the swinging range of the cam follower. However, when the tip of the locking body is dropped into the valley of the selection cam 4, the tail end 63-1 of the locking body enters the swinging range of the cam follower and is locked and integrated with the cam follower. become

If the selected pattern stitch has an automatic feed element, the cam follower for width and feed is locked by the locking body, and a reverse swinging motion is generated in the rotation of the pattern cam and feed cam. , the needle bar mechanism and the feed adjustment mechanism.

In addition, in the present invention, even if the setting is set to MANUAL, for certain stitches, the alignment is set to MANUAL in order to prevent adjustment of the width of straight stitches, triple stitches, feed pitch of super stitches, etc. It straddles both the manual and automatic switching cam and the selection cam so that it can only lock the amount of vibration and feed specific to the locking body for sewing, and the valley of the selection cam makes it possible to do so. It seems that only when faced with it will it become depressed and locked with the follower.

As described above, in the present invention, a single electric motor is used to operate the sewing machine on the one hand, and on the other hand, only the swinging cam is rotated without operating the sewing machine, and pattern selection is performed in cooperation with a solenoid. It is characterized by having multiple swinging arms in contact with the swinging cam at the same time, so that operations such as releasing the follower, selecting a pattern, and setting automatic feed can be performed quickly. In the pattern cam selection method of the present invention, a locking body and a selection cam that swings the locking body are disposed within the same plane of a thin plate-like cam follower, and the selection member for a single pattern cam is thin. The oscillating motion of the cam followers is transmitted to the terminal part of the needle bar mechanism only when they are arranged in a space and locked together, making it ideal for use in the limited narrow space within the arm machine frame of the sewing machine. It is extremely effective for arranging a large number of pattern cams in a device, and its locking relationship is unique.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is an external perspective view of a sewing machine equipped with the present invention, FIG. 2 is a front view showing essential parts of the present invention, and No. In. 4 and 5 are state diagrams of the stop device in the present invention. FIG. 6 is a plan sectional view showing the drive transmitting unit in the present invention. No. 71 is a main part of the present invention. FIG. 8 is a plan sectional view showing the main parts of the present invention. FIG. 9 is a front view showing the main parts of the invention. FIG. 10 is a front view showing one drive part in the invention. FIG. 11 is a plan sectional view showing a cam group according to the present invention, in which 1 is a patterned cam, 2 is a cam follower, 24 (ri main shaft, 63 is a locking body, 122 and 12
Reference numeral 4 denotes each transmission member to the needle bar machine configuration and feeding device.

Claims (1)

[Claims] 1 A plurality of patterned cams that are interlocked with the rotation of the main shaft, and a plurality of cam followers that are supported so that one end can be engaged with each of the cams, and that when engaged with the cams perform rocking motion according to the shape of the cams. an operating member that engages and disengages the cam follower from the pattern cam corresponding to the cam follower; and a transmission mechanism that transmits the swinging motion of the follower to at least one of the needle bar swing device or the fabric feeding device. a selection cam supported by a shaft parallel to the shaft of the pattern cam and rotated to an appropriate angular position and stopped by operation of the operating member; and a follower shaft supporting the cam follower. a swinging arm rotatably supported by the swinging arm; one end of the swinging arm is pivotally connected to the arm of the swinging arm, one end is always held in contact with the selection cam by a spring action, and the tail end is linked to the operation of the operating member. a locking body that enters into the swinging movement range of the other end of the cam follower by the selection cam and maintains a locking relationship with the other end of the cam follower; and one end on the other arm of the swinging arm. is provided with a link whose other end is connected to at least one of the horizontal swinging body of the connecting leaf rod swinging device or the feed adjuster of the cloth feeding device, and the locking body, the cam follower, and the pattern cam are connected to each other. A pattern stitch selection device for a sewing machine, characterized in that the selection cam and the selection cam are arranged in the same plane.