JPH088774Y2 - Vertical feed sewing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a presser foot switching device for a vertical feed sewing machine.

(Prior Art) A conventional presser foot of a vertical feed sewing machine has a feed dog that moves by making some teeth face through a notch window from below a needle plate fixed to a bed machine frame, and a press tooth that is pressed against the upper surface of the feed dog to move. When the cloth is fed by the upper feed dog, a presser foot is provided for pressing the cloth when the upper feed dog is separated from the cloth, and the presser foot is configured to constantly hold the cloth during the sewing machine operation. It was

(Problems to be solved by the invention) In the conventional structure, since the presser foot always presses the cloth during the sewing machine operation, the cloth feeding is excellent in straightness, but wrinkles occur on thin cloth. Points were pointed out.

(Means for Solving the Problem) The present invention solves the inconveniences of the conventional structure, in which the presser foot is constantly pressed on the cloth or the upper and lower feed dogs are pressed against the desired sewing. By pressing the cloth alternately with the upper feed dog in synchronization with the movement, the method of pressing the cloth by the presser foot can be selectively switched.

(Operation) The present invention relates to a vertical feed sewing machine having an upper feed dog that moves four feed movements by pressing the cloth from above in cooperation with the feed teeth to feed some cloth from the lower side of the throat plate, An upper feed presser bar having an upper feed dog and a presser bar 1 having a presser foot attached to a lower end thereof are coaxially supported, and a guide shaft is rotatably supported in parallel with the presser bar, and the guide shaft is used for operation. The rotating plate is attached, and an engaging plate, the tip of which is locked to the upper surface of the presser bar stick 14 fixed to the presser bar, and a guide base are slidably mounted in the axial direction. Further, an upper feed vertical crank that swings in synchronism with the operation of a sewing machine whose one end is held by a part is rotatably supported on the horizontal axis of the upper feed presser bar stick and is fixed to the upper feed presser bar. A holding bar stick holding plate which is adjacent to the engaging plate on the shaft and is rotated by the operation of the rotating plate is mounted. The pressing rod duck holding plate is rotated by operating the rotating plate, and the holding rod duck fixed to the holding rod is held by the engaging plate of the guide shaft to connect the holding rod duck and the guide base. By squeezing or squeezing, the upper and lower cranks are alternately moved up and down in synchronization with the vertical movement of the upper feed teeth due to the swing motion of the upper feed vertical cranks, or the vertical movement of the upper feed teeth is performed. It is characterized in that the presser foot is always placed on the needle plate surface regardless of the above.

(Embodiment) The structure of an embodiment of the present invention will be described below with reference to the drawings.

A presser bar 1 and a guide shaft 2 are vertically supported in parallel with each other on an arm machine frame (not shown) of the sewing machine, and the presser bar 1 is a hollow hole of a presser bar metal 3 fitted to the arm machine frame. The guide shaft 2 is rotatably supported by the arm machine frame, and is inserted into the hollow portion of the upper feed pressing rod 4 slidably supported by.

An upper feed presser bar rod 5 is fixed to the upper feed presser bar 4 and an upper feed bar guide 6 is fixed to the lower part, and an upper feed bar 8 is slidable on a horizontal support shaft 7 of the upper feed bar guide. The upper feed dog 10 is fixed to the lower end of the upper feed plate 9 attached to the upper feed plate, and the upper feed plate 9 is attached to the upper feed plate 9 via the upper feed plate link 11. The lower end of the arm 12 is connected,
The upper feed horizontal arm is pivotally attached to the machine frame so that the upper feed horizontal arm can be rocked in conjunction with the movement of a feed mechanism mounted on a bed machine frame (not shown).

A presser foot 13 is removably attached to the lower end of the presser bar 1, and a detent 14 'is inserted into the machine frame at a portion protruding from the upper end of the upper feed presser bar 4 (see FIG. 2). Daki
A presser bar adjusting spring 15 is attached to a hollow portion formed by fixing 14 to the upper part of the presser bar 1, and the upper end of the presser bar adjusting spring is an upper feed spring adjusting member 16 screwed to the arm machine frame. Holding spring adjusting screw 17 screwed to the inner screw formed in the hollow part of the
Is pressed to the lower end, and the spring pressure of the presser bar adjusting spring 15 is adjusted by the rotation of the presser spring adjusting screw.

A substantially U-shaped spring receiver 18 is placed on the upper surface of the upper feed presser bar rod 5. The lower plate portion 18 ′ of the spring receiver is fitted on the upper end of the upper feed presser bar 4 to form an upper plate. The part 18 ″ is fitted on the presser bar 1.

On the upper surface of the upper plate portion 18 ″ of the spring receiver 18, the lower end, which is actuated by the upper feed presser spring 19 interposed between the upper feed spring adjusting member 16 and the lower end, has a hemispherical pressing spring receiver 20. Is pressed.

A substantially L-shaped upper feed vertical crank 22 is rotatably supported on a horizontal shaft 21 which is planted in the upper feed presser bar Daki 5, and an arm is connected to an upper end of the upper feed vertical crank via a connecting link 23. An upper feed upper and lower arm 24, which is swingably supported by the machine frame, is connected, and an upper and lower shaft (not shown) to which the upper feed upper and lower arm is fixed reciprocates in conjunction with rotation of a sewing machine drive shaft (not shown). Dynamic movement is performed.

A roller 25 is supported on the other end of the upper feed vertical crank, and the roller is sandwiched by a forked portion 27 formed on a guide base 26 fitted to the guide shaft 2 so as to be slidable in the axial direction. Information board 26
Since it is brought into contact with the side surfaces of the upper feed vertical crank 22, rotation is blocked.

An engaging plate 30 is fixed to the guide base 26, and a tip end portion 28 thereof is brought into contact with the upper surface of the pressing rod duck 14 via a cushioning material 29, and is formed between the engaging plate and the guide base 26. Groove 31
Further, a holding rod duck holding plate 32 that rotates integrally with the guide shaft 2 is attached. The holding rod duck holding plate is fitted on the guide shaft 2, and a pin portion 34 'at the tip of a screw 34 screwed into a narrow groove 33 formed in the axial direction of the guide shaft is inserted to insert the holding rod duck. The holding plate 32 rotates together with the guide shaft 2 and can slide in the axial direction with respect to the guide shaft.

The guide shaft has a rotating plate 37 forming an operation piece 36 fixed to a portion protruding above the arm machine frame 35, and is prevented from moving in the axial direction by the rotating plate and the ring 38. An arcuate groove 39 is formed on the rotary plate 37, and the arcuate groove is inserted and fixed to the machine frame, and the rotation range of the guide shaft is limited by the stopper screw 40.

The present invention has the above-mentioned structure, and its operation will be described below. First, by operating the rotating plate 37, the guide shaft 2 is rotated so that the tip of the presser bar sticking plate 32 is pressed down. When the sewing machine is operated by removing it from the lower surface of the rod feed 14 (see FIG. 2), the upper feed upper and lower arms 24 are swung in conjunction with the rotation of the drive shaft, so that the upper feed vertical crank 22 is moved. .

The upper feed vertical crank 22 swings around the horizontal axis 21
When 25 is lowered to the same height as the horizontal axis 21, the guide base 26 and the engaging plate 30 integrated with the forked portion 27 that holds the roller 25 are also lowered at the same time,
The tip end portion 28 of the engaging plate comes into contact with the upper surface of the presser bar tack 14 to stop the lowering of the roller 25.

Since the upper feed vertical crank 22 moves by moving the center of swing to the roller 25, the horizontal axis 21 of the upper feed vertical crank 22 is raised, and accordingly, it landed on the needle plate surface H (shown in FIG. 5). The upper feed dog 10 is also raised.

At this time, the spring force of the upper feed presser spring 19 causes the engaging plate 28 to act on the upper surface of the presser bar duck 14 via the roller 25 and the guide base 26 to cause the presser bar 13 to press the presser foot 13 via the presser bar 1. It is pressed against the needle plate surface H (see FIG. 4).

Next, if the upper feed upper / lower arm 24 swings and returns to the original position, the upper feed upper / lower crank 22 also returns to its original position.
10 is landed on the needle plate surface H.

At this time, the spring force of the upper feed presser spring 19 acts on the upper feed presser bar rod 5 to press the upper feed dog 10 against the needle plate surface H.

On the other hand, only the presser bar adjusting spring 15 acts on the presser foot 13 (see FIG. 5).

As described above, while the upper feed vertical crank 20 is in operation, the presser foot 13 always receives the action of the presser bar adjusting spring 15 while landing on the needle plate surface H, and the spring force of the upper feed presser spring 19 is alternately applied. (See FIGS. 4 and 5).

 This state is the constant placement state.

The upper feed dog 10 can be moved up and down by the swinging motion of the upper feed vertical crank 22 as described above.However, when the horizontal shaft 21 of the upper feed vertical crank 22 and the roller 25 are in the same horizontal state, By the action of the upper feed horizontal arm 12 which is synchronized, the cloth is moved in the forward or backward horizontal direction, and the cloth is intermittently moved in the forward or backward direction together with the feed dog arranged below.

Next, the rotating plate 37 is operated to rotate the guide shaft 2 so that the tip of the holding bar duck holding plate 32 is rotated to the lower surface of the holding bar duck 14 (see FIG. 3) (holding bar duck). The tip of the holding plate 32 can be rotated only when the upper feed dog 10 is in the upper position. The state in which the holding rod daki 14 is held by the tip 28 of the upper engaging plate 30 (see FIGS. 6 and 7). When the sewing machine is operated, the upper feed upper / lower arm 24 swings in conjunction with the rotation of the drive shaft, and then the upper feed vertical crank 22 swings. When the upper feed vertical crank 22 swings from the state shown in FIG. 6, the work clamp 13 lands on the needle plate surface H and the upper feed dog 10 is separated from the needle plate surface H. It swings around 25 and the horizontal axis 21
When descending to the same height as 25, the upper feed dog 10 is landed on the needle plate surface H. When the needle plate surface H of the upper feed dog 10 lands, the swing center of the upper feed vertical crank 22 moves to the horizontal axis 21,
Therefore, the presser bar duck 14 is raised by way of the guide base 26 for holding the rollers and the presser bar duck holding plate 32, so that the cloth presser 13 attached to the lower end of the presser bar 1 fixed to the presser bar duck is placed first. As shown in Fig. 7, it will be raised.

Then, when the upper feed vertical crank 22 is swung,
The cloth presser 13 descends and lands on the needle plate surface H, and the upper feed dog 10 is separated from the needle plate surface H (see FIG. 7).

(Effects) The present invention has the above-described structure and operation, and by operating the rotating plate 37 fixed to the guide shaft 2, the holding rod duck holding plate 32 mounted on the guide shaft 2 is operated. The presser bar duck 14 fixed to the presser bar 1 and the guide base 26 mounted on the guide shaft 2 are integrally moved in the vertical direction or are switched so as to be moved separately from each other by the rotation of the. To make the presser foot 13 alternate with the upper feed dog 10 and the needle plate surface, or to keep the work clamp 13 always on the needle plate surface regardless of the vertical movement of the upper feed dog 10. It is a practical effect that the sewing state can be improved according to the type of fabric that can be always placed.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is an exploded perspective view of the present invention, and FIGS. 2 and 3 are A in FIG.
-Partial sectional views showing respective switching states as seen from the direction of arrow A, FIG. 4 and FIG.
The figure is an operation view of the presser foot according to the present invention in a constantly mounted state, and FIGS. 6 and 7 are operation views of the presser foot according to the present invention in an alternate mounted state. 1 is a presser bar, 2 is a guide shaft, 4 is an upper feed presser bar, 5 is an upper feed presser bar, 14 is a presser bar bar, 22 is an upper feed vertical crank, 25 is a roller, 26 is a guide, 30 is an engaging plate, 32 is a presser bar clamp plate, 37 is a rotating plate.

Claims (1)

[Scope of utility model registration request] 1. A vertical feed sewing machine provided with an upper feed dog that makes four feed motions by pressing a cloth downward from above in cooperation with a feed dog that feeds cloth by exposing some teeth upward from the needle plate, An upper feed presser bar 4 /, which is attached to the upper feed dog and supported by a sewing machine frame so as to be vertically movable, and a presser bar 1 having a presser foot attached to the lower end thereof are coaxially provided, and a guide shaft parallel to the presser bar is provided. 2 is rotatably supported, and a rotating plate 37 for operation is fixed to the guide shaft, and an engaging plate 30 and a guide base whose front end is locked to the upper surface of the press rod stick 14 fixed to the press rod 1. 26 and 26 are mounted so as to be slidable in the axial direction, and a roller at one end is attached to the forked portion of the guide base.
An upper feed vertical crank 22 that is clamped by 25 and swings in conjunction with the operation of the sewing machine is rotatably supported on the horizontal shaft 21 of the upper feed presser bar sticker fixed to the upper feed presser bar 4, and the guide shaft 2. A vertical feed sewing machine characterized in that a holding bar duck holding plate 32, which is adjacent to the engaging plate 30 and is rotated by the operation of the rotating plate 37, is mounted on the upper part of FIG.