JPH0116196B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pattern selection device for a sewing machine, and more particularly to a device for selecting various sewing patterns using an electrical drive system.

The purpose of the present invention is to comprehensively determine the optimal conditions for sewing a certain pattern, such as the horizontal needle width of the needle, the rotational speed of the sewing machine, the height of the feed dog, and the pressure of the presser foot. The purpose is to automatically set the amount to an appropriate value, and another purpose is to quickly and smoothly perform the setting operation using an electrical drive system, and another purpose is to use the setting to drive the sewing machine. Another purpose of the invention is to connect the sewing machine to a needle bar support mechanism or cloth feeding mechanism that engages with the pattern sewing cam and makes a swinging movement of the terminal. The purpose is to enable cam followers that retrieve stored data and transmit motion to be arranged close to each other in a limited space, and another purpose is to arrange a large number of them in parallel and support in a narrow space. The lock body is engaged and locked with the follower to transmit movement 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 1 is mounted on the main shaft.
01 and a bush 27 are fixed to the worm 101, and a worm wheel (not shown) fixed to a pattern cam shaft 103 rotatably supported by a unit mechanism base 102 fixed in the arm machine frame. A belt wheel 2 is meshed with the bushing 27, and a gear 104 is integrally fixed to the outer periphery of the bush 27.
A stop cam 31 is loosely fitted into the belt pulley 23 and has a clutch engaging/disengaging cam 26 formed on the outer periphery of one end and a stopper engaging portion 29 and an inclined engaging portion 30 on the other end side surface. A clip belt 5 driven by a drive motor (not shown) is hung around the outer periphery, and a step 1 provided on the bush 27 is normally attached to the side by the action of a spring 106.
A clutch arm 25 is pivotally connected to the clutch arm 25 so that the belt pulley 23 is rotated integrally with the bush 27, that is, the main shaft 24. Furthermore, the main shaft 2
4 includes a coil spring 28, one end of which is fixed to the bushing 27, and the other end of which is engaged with a partially large cutout 105' of the stop cam 31 which is loosely fitted around the outer periphery of the bushing;
A large screw 107 screwed onto the end of the main shaft prevents the main shaft from falling off in the axial direction, and a handwheel 108 whose one end is locked to the stop cam 31 is loosely fitted onto the outer periphery of the inner shaft.

The stopper engaging portion 29 of the stop cam 31 is adapted to come into contact with the tip of a stopper 33 which is pivotally mounted 147 to the machine frame and receives the pressing action of the spring 34; The first arm 148 is brought into contact with the stopper engaging/disengaging arm 35 which is subjected to the action of the spring 36, and the engaging/disengaging arm 35
A second arm 149 is formed to be held by the holding arm 37 (see FIG. 5), and a plunger of the solenoid 9 is connected to the end of the engaging/disengaging arm 35.

On the pattern cam shaft 103, a pattern cam 1 and an automatic feed cam 116 for sewing various patterns displayed on a panel 109 on the outside of the machine frame are connected to the worm 10.
are laminated so that they can rotate integrally with 1,
One end of a cam follower 2 provided for each pattern cam is connected to and disengaged from each pattern cam 1, and the cam follower swings on a follower shaft 110 fixed to the unit mechanism base 102. The other end 2-1 is pivotally connected to a fixed shaft 113 between two first arms 112 protruding from a swinging arm 111 rotatably supported by the follower 110. The shape is such that it can be locked with the tail end 63-1 of the locking body 63, and one end of the locking body is connected to the mechanism base 10.
The selection cam 4 is rotatably fitted onto a selection cam shaft 115 fixed to the selection cam shaft 115 . Second arm 1 of the swinging arm body 111
17 is connected via a link 118 to an end of a horizontal swinging body 119 which is pivotally mounted 121 to the mechanism stand 102 so as to be swingable. On the arcuate wall 120 of the horizontal swing body, there is a swing rod 1 whose other end is connected to a needle bar support (not shown) that supports the needle bar and is made to swing.
A short shaft 123 of the mounting member is pressed against one end of the member 22 by the action of a spring. Moreover, the automatic feed cam 1
16, one end of the cam follower 2 is adapted to be engaged and disengaged, and the other end 2-1 is connected to the feed swing arm 1 rotatably supported by the follower shaft 110.
It is shaped so 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 25, and one end of the locking body is connected to the selection camshaft 115. The arm 125' has a rod 1 connected to a feed adjuster (not shown) at its lower end.
It is connected to 24. Further, the follower shaft 110 is further provided with a tail shaped so as to be able to lock with each tail end 63-1 of the two locking bodies 63 pivotally attached to the arm 125' of the sending swing arm body 125. Two rocking bodies 140 each having an end 2-1 are fitted adjacent to each other, and a manual operation cam 16 fitted to the release cam shaft 126 fixed to the mechanism base 102 is attached to the end of the rocking body. It is connected via a rod 128 to the end of the follower 12 which is pivotally supported 127 so as to engage one end thereof. One is adapted to be engaged with the switching cam 18 fitted on the camshaft 115, and the other is adapted to be engaged across the switching cam 18 and the selection cam 4 for manual use. (See Figure 8). Also, follower shaft 1
10 has a claw body 1 provided with short claws 141 and long claws 142.
43 is rotatably supported (see Figure 9),
The short claws are engaged with a switching cam 19 rotatably fitted on the selection cam shaft 115, and the long claws 142 are engaged with a swing width control plate 144 rotatably supported on the shaft 127. A follower 146 that engages with the swing width limiting cam 49-2 is locked via a swing width locking arm 145 pivotally connected to the swing width limiting cam 49-2.

A swing cam shaft 13 fixed to the mechanism stand 102
A swing cam 88 is rotatably fitted to the belt wheel 23, and the cam is connected to a bevel gear 132 coaxial with a gear 131 that meshes with a gear 104 that is integrated with the belt wheel 23, and a bevel gear 1 that meshes with the gear.
33 (see FIG. 6).

The swing cam 88 has a shaft portion 1 fixed to the mechanism stand 102.
Swing arm 91-1, 9 rotatably supported by 34
1-2 and 91-3 are adapted to be engaged with each other, and the first other end 1 of the swinging arm 91-1
35 is connected to the solenoid 7 so as to be actuated by the drive of the solenoid 7, and the second other end 13
6 is a ratchet wheel 89- which is integrated with a switching cam 20 that can rotate on a shaft 129 fixed to the mechanism base 102.
A claw 90-1 for locking the tip claw is pivotally supported on the swing arm 91-2, and the first other end 135 of the swing arm 91-2 is connected to the solenoid 8 so that it can be actuated by the drive of the solenoid 8. A pawl 90-2 is pivotally supported on the second other end 136 of the arm 91-2, and the pawl 90-2 locks the distal pawl to a pawl wheel 89-2 that is integral with the cam switch 10 and is rotatable on the shaft 129. Also, the swinging arm 91
The first other end 137 of -3 is connected to a long groove 139 provided at the end of a link connected to the solenoid so that it can be operated freely by the drive of the solenoid 6. A pawl 90-3 for locking the tip pawl is pivotally supported on a pawl wheel 89-3 which is integral with the release cam 3 and is rotatable on the release cam 126. A switch 80 is provided which is connected to each of the solenoids 6, 7, and 8 and is operated to be energized when any one of the solenoids is driven.
(See figure 0).

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 is made, 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, the switch 80 is closed and the electric motor is energized, allowing the belt pulley 23 to rotate at a low speed without operating the controller. At this time, the main shaft 24 is maintained in a state in which it is not rotated by being locked at a constant phase by a stopping device activated by the drive of the solenoid 9. When the belt pulley 23 rotates, the swing cam 88 is rotated, so when the swing arm 91-3 engages and swings with the swing cam 88 due to the drive of the solenoid 6, the claw 90-3 becomes a claw. The wheel 89-3 is turned to rotate the release cam 3 and release the cam follower from the cam. The rotation switch 10 is activated by the rotation of the release cam 3.
-1 is rotated, the circuit is changed, the current to the solenoid is cut off, and the swinging of the swinging arm is stopped. Subsequently, when the solenoid 7 is driven, the pawl 90
-1 is driven, the ratchet wheel 89-1 and the switching cam 20,
18 and 19 are rotated, then the solenoid 8 is driven, the selection cam 4 is rotated, and the locking body 63 corresponding to the pattern cam 1 on which the desired pattern sewing is to be performed enters into a locking relationship with the cam follower 2. .

To explain this locking relationship in more detail, both the cam follower 2 and the locking body 63 are rotatably supported within the same plane, and in the non-selected state, the locking body is placed outside the swinging range of the cam follower. The tip of the locking body is brought into contact with the peak of the selection cam 4, but 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 is brought into contact with the peak of the selection cam 4.
enters the swinging range of the cam follower and is locked and integrated with the cam follower. If the selected pattern stitch has an automatic feed element, the cam follower for the width and feed is locked by the locking body, and the rotation of the pattern cam and feed cam generates an oscillating movement, and the needle bar mechanism and feed adjustment mechanism.

In addition, in the present invention, even when set to MANUAL, it is not possible to adjust the width of straight stitches, triple stitches, feed pitch of super stitches, etc. in certain specific stitches. The locking body straddles both the manual and automatic switching cam and the selection cam so that it can only lock the specific swing width and feed amount, and this is possible when faced with a valley in the selection cam. Only the follower is depressed and locked.

As described above, the present invention uses a single electric motor to operate the sewing machine on the one hand, and on the other hand, rotates only the swing cam without operating the sewing machine, and selects a pattern in cooperation with a solenoid. It is characterized by having a plurality of 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, and As a pattern cam selection method in the present invention, only when a locking body is disposed within the same plane of the thin plate-like cam followers to lock them together, the swinging motion of the cam followers is transferred to the terminal part of the needle bar mechanism, etc. What I have tried to convey is extremely effective for arranging a large number of pattern cams in a limited narrow space within the arm machine frame of a sewing machine, and the locking relationship is unique. .

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is an external perspective view of a sewing machine to which the present invention is installed, and FIG.
The figure is a front view showing the main parts of the present invention, Figure 3 is a front sectional view of the drive transmission section in the present invention, Figures 4 and 5 are state diagrams of the stop device in the present invention, and Figure 6 is the drive in the present invention. FIG. 7 is a front view showing the main parts of the present invention; FIG. 8 is a plane cross-sectional view showing the main parts of the invention; FIG. 9 is a front view showing the main parts of the invention. , FIG. 10 is a front view showing a drive unit in the present invention, FIG. 11 is a plan sectional view showing a cam group in the present invention, and FIG. 12 is an electric circuit diagram in the present invention, where 1 is a patterned cam, and 2 is a patterned cam. cam follower,
24 is the main axis.

Claims (1)

[Claims] 1 A main shaft that is rotatably supported within the arm machine frame and causes the needle bar and feed to move synchronously, or a plurality of pattern cams that are rotated at a reduced speed in conjunction with the main shaft when the main shaft rotates. A pattern stitch selection device for a sewing machine consisting of a single motor that drives a follower to release and release the engagement.