JPS6040200Y2 - Sewing machine cloth feed device - Google Patents

Description

[Detailed explanation of the invention] This invention is based on the idea that the workpiece cloth is held between a feed plate attached to a feed stand on the bed surface of the sewing machine and a presser foot supported by a presser foot arm on the feed stand. The present invention relates to a fabric feeding device for a sewing machine that feeds a workpiece fabric according to the movement of a feed base in the vertical and lateral directions as the first and second feeding cams interlock with the main shaft of the sewing machine rotate.

Generally, in the cloth feeding device of this type of sewing machine, the presser foot supported by the presser foot is urged toward the feed plate by the presser foot spring, so the reaction force of the presser foot spring pushes against the presser foot. There is a risk that the intermediate portion of the feed table may rise above the bed surface of the sewing machine, thereby interfering with the feed operation.

For example, when the work cloth to be sewn is thick, the reaction force of the cloth presser spring increases by the thickness, and this tendency is manifested as a floating blade of the feed table.

For this purpose, in the conventional device, the feed cam is fitted into a long hole formed in the middle part of the feed cam, and guides the vertical movement of the feed cam as the first feed cam rotates. A flange is provided at the upper end of the actuating body having a guide section for moving the feeder in the lateral direction as the feeder rotates, and the lower surface of the flange is brought into contact with the upper surface of the feeder at both ends of the elongated hole. This was designed to prevent the feed platform from lifting up.

However, in this conventional device, when the feed base is moved by the reaction force of the presser foot spring, the lower surface of the collar of the actuating body comes into pressure contact with the top surface of the feed base, which impedes the smooth movement of the feed base. As a result, the work cloth cannot be fed accurately, and unreasonable force is applied to the drive system of the feed table, causing contact between the connecting parts in the drive system and the bottom surface of the collar and the top surface of the feed table. The defect was that the parts were severely worn.

To this end, a configuration has been proposed in which a plurality of rollers that can be freely rotated and engaged with the lower surface of the collar are arranged at fixed positions on the upper surface of the feeder; When the roller is moved under force, slippage may occur between the outer circumferential surface of the roller and the lower surface of the collar, which may prevent the roller from rotating freely.
The above-mentioned defects could not be resolved.

This invention eliminates the defects in the conventional device as described above, and creates a new fabric feeding device for sewing machines that allows the feeding table to move smoothly and feed the workpiece fabric accurately, while also dramatically reducing wear on each part. The purpose is to provide

Hereinafter, this invention will be explained based on an example in which this invention is embodied in a cloth feeding device of a bar-lock sewing machine. In the drawing, 1 is a bed of the sewing machine, 2 is a cover plate attached to the bed 1, Through holes 2a and 2b are formed.

3 is a needle plate installed on the bed 1, and has a needle hole 3a.
is formed.

Then, a bed surface 4 is provided on each upper surface of the cover plate 2 and throat plate 3.
is formed.

A needle bar 5 is attached to the arm of the sewing machine so as to be movable up and down, and a needle 6 is attached to the lower end of the needle bar.

Reference numeral 7 denotes a feed stand movably arranged on the bed surface 4, one fitting hole 7a and two accommodation recesses 7b are formed at one end, and one end is formed in the middle part. An elongated hole 7c is formed extending from the end toward the other end.

A feed plate 8 is attached to the other end of the feed base 7 with two mounting screws 9, and has a needle drop opening 8a formed at a position corresponding to the needle hole 3a of the throat plate 3.

As shown in FIG. 2.3.5, rollers 10 are rotatably provided in the accommodation recesses 7b of the feed table 7 by means of support pins 11, and the rollers 10 are rotatably provided in the accommodation recesses 7b of the feed table 7, and the feed table 7 is rotated from inside each accommodation recess 7b.
It protrudes slightly from the lower surface of the holder so that the feed table 7 can be moved smoothly on the bed surface 4.

Reference numeral 12 denotes a presser arm whose base end is fixed to the upper surface of one end of the feed base 7 by four mounting bolts 13, and a movable plate 14 is supported at the tip of the presser arm so as to be movable up and down.

15 is for holding the work cloth between it and the feed plate 8;
The presser foot is attached to the lower end of the movable plate 14 with a mounting screw 16, and has a needle drop opening 15a that matches the needle drop opening 8a of the feed plate 8.

A presser lever 17 is rotatably supported on the presser arm 12 by a support shaft 18, and is linked to the movable plate 14 at one end thereof.

Reference numeral 19 denotes a presser spring interposed between the other end of the presser lever 17 and the presser arm 12, which urges the presser lever 17 to rotate in the counterclockwise direction in FIG. The presser foot 15 is pressed against the feed plate 8.

In this embodiment, by operating a pedal or the like, the presser foot lever 17 can be rotated clockwise in FIG. It looks like this.

20 is the fitting hole 7 of the feed base 7 as shown in FIGS. 1 and 3.
It is a support cylinder having a spherical inner surface that is fitted and fixed in the inside of the support cylinder, and a substantially spherical support body 21 is rotatably provided inside the support cylinder.

Reference numeral 22 denotes a first unit swingably supported in the bed 1 of the sewing machine.
The operating arm has a tip end protruding into the through hole 2a of the cover plate 2, and a connecting pin 23 fitted into the support body 21 is fixed to the tip end.

The first actuating arm 22 is swung by a well-known first feed cam that rotates in conjunction with the main shaft of the sewing machine as the sewing machine is operated, and moves the feed table 7 in the vertical direction ( 1 and 2).

Reference numeral 24 denotes a second actuating arm whose base end is swingably supported within the bed 1 of the sewing machine, and its tip end extends through the cover plate 2 as shown in Fig. 1.4.5. A long hole-shaped recess 24a is formed on the upper surface of the hole 2b and protrudes into the hole 2b.

25 is a wear prevention plate made of a hardened steel plate or the like fixed to the bottom surface of the recess 24a; 26 is a spherical body that is removably housed in the recess 24a; They are in sliding contact with each other to prevent the second actuating arm 24 from floating up.

The second operating arm 24 is oscillated by a well-known second feed cam that is rotated in conjunction with the main shaft of the sewing machine as the sewing machine is operated.

Reference numeral 27 denotes an actuating member that is provided at the tip of the second actuating arm 24 and constitutes an actuating body together with the second actuating arm 24, and as shown in Fig. 1.2.6, the length of the feed base 7 is Consisting of a guide piece 28 that is fitted into the hole 7c and has a rectangular planar shape, and an actuation pin 29 that is loosely fitted into the guide piece 28 and fixed to the second actuation arm 24, the actuation pin 29
A flange portion 29a is formed at the upper end of the guide piece 28 so as to protrude from the upper end of the guide piece 28 onto the feed table 7 on both sides of the elongated hole 7c.

The guide piece 28 of the actuating member 27 cooperates with the elongated hole 7c to guide the movement of the feed table 7 in the vertical direction by the first actuating arm 22, and the guide piece 28 and the actuating pin 2
Reference numeral 9 is adapted to move the feed table 7 in the lateral direction (vertical direction in FIG. 2) as the second operating arm 24 swings.

Reference numeral 30 designates a pair of grooves formed on the upper surface of the feed base 7 so as to extend parallel to the elongated hole 7c on both sides of the elongated hole 7c below the flange 29a of the actuating member 27, and reference numeral 31 represents a fixing pin that also serves as a stopper. 32 is a wear prevention plate made of a hardened steel plate or the like fixed to the bottom surface of each groove 30, and as shown in FIGS. 2 and 5, a stopper part 31a is folded at the end opposite to the fixed pin 32. A song is formed.

33 is a retainer which is housed in each groove 30 between the fixing pin 32 and the stopper part 31a so as to be movable only in the longitudinal direction of each groove 30; As shown in the figure, a large number of housing holes 33a are formed at equal intervals in the longitudinal direction, and a retainer 33 is formed at both longitudinal ends by engagement with the flange 29a of the actuating member 27. The protrusions 33b are respectively bent to prevent them from coming off.

34 is the accommodation hole 3 of each retainer 33 as shown in FIG.
3a, and are rotatably supported in the housing hole 33a by caulking both the upper and lower openings of the housing hole 33a, and the retainer
The flange portion 2 of the actuating member 27 slightly protrudes vertically from 33.
The lower surface of the groove 9a and the upper surface of the wear prevention plate 31 in the groove 30 are in contact with each other.

Therefore, the intermediate portion of the feed base 7 is connected to the flange portion 2 of the actuating member 27.
9a is held on the bed surface 4 of the sewing machine via the balls 34 of the retainer 33, and is held so as not to rise above the bed surface 4, and the feed table 7 is moved in the vertical direction by the first operating arm 22. When the retainer 33 is moved in the same direction by half the amount of feed of the feed table 7 as a large number of balls 34 roll, the movement of the feed table 7 is performed smoothly.

Reference numeral 35 denotes a cover detachably attached to the feed table 7 so as to cover the upper part of the retainer 33, etc., and a locking recess 36 for the feed table 7 and the presser arm 12 is provided at both ends of the longitudinal direction of the cover. Locking portions 35a and 35b that can be engaged with 37 are provided in a protruding manner.

The operation of the fabric feeding device configured as described above will be explained below.

First, when the presser foot lever 17 is rotated clockwise in FIG. 1 against the action of the presser foot spring 19 by the operator's pedal operation or the like, the presser foot 15 is raised via the movable plate 14. A gap is formed between the feed plate 8 and the feed plate 8.

In this state, when the work cloth is placed on the feed plate 8 and the pedal is returned, the presser foot lever 17 is moved from the cloth presser spring 19.
The presser foot 15 is rotated counterclockwise by the action of
5 and the feed plate 8.

After that, when the sewing machine is started, the first feed cam rotates in conjunction with the main shaft of the sewing machine, and the first actuating arm 22
is swung, and the feed table 7 is moved in the vertical direction (horizontal direction in FIGS. 1 and 2), and the second actuating arm 24 is also swung by the second feed cam, so that the feed table 7 is moved in the horizontal direction (vertical direction in FIG. 2).

Therefore, as the feed plate 7 moves, the work cloth held between the presser foot 15 and the feed plate 8 is fed in the vertical and horizontal directions so as to cross the drop point of the needle 6. As a result, a bar fastening seam or the like is formed.

During this sewing work, the presser foot 15 is
is pressed toward the feed plate 8 by the action of the presser foot spring 19, and the work cloth is clamped between it and the feed plate 8, so that the reaction force of the presser foot spring 19 is applied to the base end of the presser foot arm 12. The proximal end side is pressed downward.

Therefore, a pressing force is applied to the upper surface of one end of the feed table 7 that integrally supports the base end of the presser arm 12, and a floating blade acts on the intermediate portion of the feed table 7.

However, in this embodiment, since the intermediate portion of the feed table 7 is held on the bed surface 4 of the sewing machine by the flange 29a of the actuating member 27 via the balls 34 of the retainer 33, the feed table 7 is The middle part does not rise.

Further, when the feed table 7 is moved in the vertical direction by the first actuating arm 22 as described above, the balls 34 on the retainer 33 are worn out on the lower surface of the flange 29a of the actuating member 27 and in the groove 30. Since the retainers 33 are rolled in contact with the upper surface of the prevention plates 31 and moved in the same direction by half the amount of feed of the feed table 7, the movement of the feed table 7 is not obstructed at all. do not have.

Therefore, an unreasonable force is not applied to the drive system of the feed table 7, and wear is not caused to the connecting parts in the drive system and the corresponding contact parts between the lower surface of the flange 29a and the upper surface of the feed table 7, and the feed table 7 is prevented from being worn. 7 can be moved smoothly and the work cloth can be fed accurately.

Note that this invention is not limited to the structure of the embodiment described above, and the structure of each part can be arbitrarily changed without departing from the spirit of this invention. In addition to sewing machines, the invention can also be embodied in various cycle sewing machines.

As described in detail above, this invention has a retainer that rotatably supports a large number of balls within the grooves, which form a pair of grooves extending parallel to the long hole on both sides of the long hole on the top surface of the feed table.
are accommodated so as to be movable only in the longitudinal direction of the elongated hole, and these balls fit into the elongated hole of the feeder and guide the movement of the feeder in the longitudinal direction of the elongated hole, and the feeder is moved in the elongated hole. Since the lower surface of the flange of the actuating body for moving in the direction perpendicular to the longitudinal direction is configured to contact the bottom surface of the groove, the feed plate is moved even though the reaction force of the presser spring is acting on the feed base. First, the feed table moves smoothly on the bed surface of the sewing machine without lifting up, allowing the workpiece cloth to be fed accurately.Moreover, no excessive force is applied to the drive system of the feed table, and its drive This provides an excellent effect of reliably preventing wear of the contact portions of the various connecting portions in the system and the members for preventing the feed table from lifting up.

[Brief Description of the Drawings] Fig. 1 is a partial vertical cross-sectional view showing the fabric feeding device of a bar-clamp sewing machine embodying this invention, and Fig. 2 shows the fabric feeding device of Fig. 1 with the presser arm removed and the cover removed. 3 is a partial enlarged plan view with a part broken away; FIG. 3 is a partial reduced sectional view taken approximately along the line 3-3 in FIG. 2; 5 is a partially reduced sectional view taken approximately along line 5-5 in FIG. 2, FIG. 6 is a partial sectional view taken approximately along line 6-6 in FIG. 2, and FIG. 7 is a part of FIG. 6. FIG. 2 is an enlarged partial cross-sectional view. Sewing machine bed...1, cover plate...2,
Throat plate...3, Bed surface...4, Feed plate...7, Long hole...7c1 Feed plate...
...8, Presser foot...12, Presser foot...
...15, Presser foot lever...17, Presser foot spring
...19, First actuating arm ...22,
Second actuation arm...24, actuation member...
...27, Guide piece ...28, Operation pin ...
...29, Flange section...29 aX groove section...
...30, Anti-wear plate...31, Retainer...
...33, Ball...34°

Claims (1)

[Claims for Utility Model Registration] 1. A sewing machine which is disposed on the bed surface of a sewing machine, one end of which is operatively connected to a first feed cam that rotates in conjunction with the main shaft of the sewing machine, and a feed plate is attached to the other end. , and a feed plate in which a long hole extending from the one end to the other end is formed in the intermediate portion, and a cloth fixed or integrated with the feed plate and urged toward the feed plate by a cloth presser spring. The presser foot, on which the presser foot is supported, is fitted into the elongated hole of the feeder, guides the movement of the feeder in the longitudinal direction of the elongated hole by the first feed cam, and is interlocked with the main shaft of the sewing machine. A guide part for moving the feed base in a direction perpendicular to the longitudinal direction of the elongated hole in conjunction with the rotated second feed cam, and a guide part that extends from the upper end of the guide part onto the feed base on both sides of the elongated hole. a pair of grooves formed on the upper surface of the feed carriage so as to extend parallel to the long hole on both sides of the long hole below the flange of the working body; A pair of glue retainers rotatably accommodated in each groove so as to be movable only in the longitudinal direction thereof, and capable of contacting the lower surface of the collar and the bottom surface of the groove. Cloth feeding device for sewing machines. 2. A utility model registration request characterized in that each of the pair of glue retainers is provided with a protrusion at each end in the longitudinal direction to prevent the glue retainers from coming off by engaging with the flange. A cloth feeding device for a sewing machine according to scope 1.