JPS6012532Y2 - sewing machine - Google Patents

Description

[Detailed Description of the Invention] Technical Field This invention relates particularly to a sewing machine having a presser device for sewing sewn pieces such as labels and names onto work cloth.

Conventional technology In order to sew sewing pieces such as names and labels to processed cloth,
When forming an annular seam around the periphery of the sewing piece, conventionally, as shown in FIG. crankshaft 32
When the needle moves relatively from the sewing start point 33 to the intermediate point 34, the crankshaft 32 is rotated in the opposite direction (indicated by the chain line in the figure). The configuration has been such that interference with the crankshaft 32 is avoided and an annular seam is obtained.

However, with this configuration, a special mechanism must be provided to reverse the crankshaft 32, resulting in a complicated structure and increased costs.

Purpose This invention was made to solve the above-mentioned problems, and the purpose is to provide a sewing machine that can simplify the construction to obtain a closed annular seam and reduce costs. There is a particular thing.

EXAMPLE Hereinafter, an example in which this invention is embodied in a cycle sewing machine will be described based on the drawings.

As shown in FIGS. 1 and 2, there is a feed table 25 on the sewing machine bed surface 1, and a presser arm 3 fixed to the feed table 25.
is disposed so as to be movable back and forth and left and right with respect to the vertical movement path of the needle 4, and furthermore, a cloth support plate 2 having a through hole 2a in the center is attached to one end of the feed base 25, and the cloth support plate 2 A work cloth C is placed on top.

Further, the feed table 25 and the presser arm 3 are moved by a pair of pulse motors (not shown) that are driven in accordance with data for cloth feeding stored in a storage device.

Of course, instead of using such a pulse motor, it may be moved by a feeding cam that has been known for a long time.

As shown in FIG. 2, a pair of left and right first and second supports 5, 6 are supported at the tip of the presser arm 3 so as to be movable up and down separately.

Pins 5a and 6a are protruded near the upper ends of both supports 5.6, and are engaged with elongated holes 7a and 7b of different lengths in the guide plate 7 attached to the front part of the presser arm 3, respectively. are doing.

Above both pins 5a, 6a, one ends of wire springs 8, 9 are secured to each of the supports 5, 6 for elastically biasing these supports 5, 6 downward, respectively.

Further, in front of both the supports 5 and 6, a lifting rod 10 that engages with the pins 5a and 6a from below is arranged to be movable up and down.

When the lifting rod 10 is lifted by depressing the presser foot lifting pedal (not shown), one of the pins 5
The second support 6 with the other pin 6a located below a is first raised, and then the first support 5 is raised.

Further, when the pedal is released, the spring force of the wire spring 8.9 and its own weight cooperate to lower the pedal to the first support 5 and the second support 6 in this order.

As shown in FIGS. 1 and 2, a first outer support plate 11 having a substantially hook-like planar shape is attached to the lower end of the first support 5, and the first support 5 is in the lowered position. Sometimes,
The work cloth C is pressed against the cloth support plate 2 from the lower surface of the first outer press plate 11.

A positioning plate 12 having a pair of front and rear elongated holes 12a is supported on the upper surface of the front protrusion of the first outer holding plate 11 so that its position can be adjusted in the left-right direction by a pair of adjustment screws 13. One end edge has a bent portion 12b for engaging with one side edge of a sewing piece W such as a label or name placed on the work cloth C to position the sewing piece W in the left-right direction. It is formed.

Further, the positioning of the sewing piece W in the front and back direction is performed by the first
This is done by the front end surface 11a of the outer holding plate 11.

As shown in FIG. 1, a second outer press plate 14 for pressing the work cloth C onto the cloth support plate 2 is attached to the lower end of the second support body 6.

As shown in FIG. 3, a sliding guide plate 15 having a guide 1815a on the lower front surface is fixed onto the second outer holding plate 14 by a pair of screws 26. As shown in FIG.

In the guide groove 15a, an intermediate body 16 having a planar shape is supported at its base end so as to be slidable in the left and right horizontal directions, and its distal end 16a is as shown in FIG. The sewing piece W protrudes forward so as to cross the sewing piece W.

At the tip end 16a of the intermediate body 16, an intermediate presser plate 17 made of transparent synthetic resin has a similar shape to the sewing piece W, and is smaller than the sewing piece W by at least the seam allowance.
is installed.

When the second support body 6 is lowered, the intermediate presser plate 17 is lowered together with the second outer presser plate 14, the sliding guide plate 15, and the intermediate body 16, so that the second support plate 6 is lowered. As shown in the figure, its lower surface presses the sewing piece W placed on the work cloth C in the through hole 2a of the cloth support plate 2 toward the bed surface 1.

In addition, 17a in the figure is an oblique relief surface formed on the lower side of one end edge of the intermediate presser plate 17.

Further, as shown in FIGS. 1 and 2, a support pin 15b protruding from the upper surface of one end of the sliding guide plate 15, and a support pin 16b inserted into the base end of the intermediate body 16. A tension spring 18 is tensioned between the
is elastically biasing the intermediate body 16 to the left in FIG.

The support pin 16b is locked to the other side edge of the sliding guide plate 15 by the spring force of the tension spring 18, and at the time of this locking, the - side of the tip 16a of the intermediate body 16 is It is placed adjacent to the sewing point A on the vertical movement path of the needle.

On the other hand, an engaging body 20 is fixed to the lower end of a support rod 19 that is supported by a sewing machine arm (not shown) so as to be movable up and down.

An engaging portion 21 is integrally formed at the distal end of the retaining portion body 20, and a passage hole 21a is provided through the retaining portion 21 through which the needle 4 that is moved up and down passes.

This engaging part body 20 is connected to a direct current motor (not shown) capable of forward and reverse rotation, and when the direct current motor rotates in one direction, the support rod 19 is lowered during sewing to a downward working position close to the sewing piece W. At the end of sewing, the DC motor is rotated in the opposite direction based on the end code of one sewing cycle stored in the storage device, so that the support rod 19 is raised and separated from the sewing piece W. is placed in the upper inactive position.

Further, when the retaining member 20 is placed in the operating position as shown in FIG. 2, the engaging portion 21 thereof faces one side of the distal end portion 16a of the intermediate member 16.

Therefore, during sewing, the presser arm 3 and the cloth support plate 2
, the stitch formation moves from the sewing point A shown in FIG. 1 in the direction of the arrow Q along the outer periphery of the intermediate presser plate 17 to the sewing point B1 shown in FIG. When the body 16 advances to the other side of the distal end 16a, the retaining portion 21 engages with the distal end 16a, thereby causing relative movement between the intermediate body 16 and the second support 6. occurs, and the intermediate body 16 is slid in the direction of arrow P in FIG.

Next, the operation of this cycle sewing machine configured as described above will be explained.

First, when the presser foot lifting pedal is depressed, a microswitch (not shown) is activated, the DC motor is rotated, the support rod 19 is raised, and the retaining body 20 is placed in the inactive position. is raised, and the second and first supports 6, 5 are successively raised via the pins 6a, 5a against the spring force of the wire spring 9.8.

Then, the second outer press plate 14, the sliding guide plate 15, the intermediate body 16, and the intermediate press plate 17 are lifted together, and then the first outer press plate 11 is lifted together with the positioning plate 12.

In this state, after placing the work cloth C on the cloth support plate 2, the pedal is released until the first outer press plate 11 descends onto the work cloth C.

Then, a sewing piece W such as a label/name is placed on the work cloth C, and at this time, one side edge of the sewing piece W is brought into contact with the bent portion 12b of the positioning plate 12, and at the same time, Positioning is performed by bringing the other side edge into contact with the front end surface 11a of the first outer holding plate 12.

After that, if you completely release the pedal,
The second outer press plate 14 and the intermediate press plate 17 are lowered together with the second support body 6.

Therefore, the work cloth C is pressed against the cloth support plate 1 by the pressing action of the second outer press plate 14 and the first outer press plate 11.
At the same time, the sewing piece W is securely held at a predetermined position on the workpiece cloth C by the intermediate presser plate 17.

Further, as the presser foot lifter pedal is released, the microswitch is operated again, and the presser foot is lowered to the retainer body 20 via the DC motor.

By the way, FIG. 1 shows the state in which the work cloth C and the sewing piece W are set in the predetermined positions in the through hole 2a of the cloth support plate 2 as described above, and in this case, the sewing point A is at the sewing point. It indicates a starting point.

When sewing is started in this state, the needle 4 is moved up and down, and the cloth support plate 2 and presser arm 3 are moved by a pair of pulse motors according to the data stored in the storage device.
The needle 4 is moved back and forth and left and right with respect to the vertical movement path, and the needle 4 is relatively moved in the direction of arrow Q from the sewing start point A along the outer periphery of the intermediate presser plate 17.

When the needle 4 reaches the sewing point B while forming an annular stitch as shown by the chain line in FIG.
1 engages with the other side of the tip 16a of the intermediate body 16.

When sewing is further continued, the intermediate body 16 is attached to the engaging portion 21.
3, it is slid in the direction of arrow P in FIG. 3 while resisting the spring force of the tension spring 18.

At this time, since the relief surface 17a is formed on the intermediate presser plate 17, the movement of the intermediate presser plate 17 is prevented by the corner of the work cloth C that has fallen into the through hole 2a of the cloth support plate 2. There is no such thing as

Therefore, the needle 4 can advance past the sewing start point A to the sewing end point E as shown in FIG. Can be seamed.

Thereafter, a tacking stitch is applied to the portion between the sewing start point A and the sewing end point B, so that the sewing piece W can be sewn onto the workpiece cloth C reliably.

It should be noted that when the intermediate body 16 is moved, the intermediate presser plate 17 is also slid and moved on the sewing piece W at the same time, but at this time, almost the entire periphery of the sewing piece W is sewn onto the workpiece cloth C. Because of this condition, there are no problems such as misalignment of the sewing position or wrinkles.

When the sewing is finished and the needle 4 is raised in this way, the engaging part body 20 is moved upwardly to the non-working position together with the support rod 19 as described above, and the distal ends of the retaining part 21 and the intermediate part body 16 are 16a is released, the intermediate body 16 is moved back to the position shown in FIG. 1 by the spring force of the tension spring 18.

Thereafter, when the presser foot lifting pedal is depressed, both the supports 5 and 6 are lifted as described above, and the work cloth C is lifted onto both outer presser plates 1.
1.14 and the sewing piece W is also released from the intermediate presser plate 17, so that the work cloth C can be taken out from above the bed surface 1.

Effects As detailed above, this invention supports an intermediate presser plate for pressing the sewing piece against the workpiece cloth on an intermediate body on a support body, and makes the intermediate body slidable in the horizontal direction. At the same time, an engaging part body capable of engaging with the intermediate part body is provided near the vertical movement path of the needle, and when sewing is completed, this engaging part body moves the intermediate part body relative to the support body, and the sewing process is performed. By configuring the seam formed on the attachment piece to be a closed annular seam,
Unlike conventional sewing machines, this machine does not require a complicated mechanism for reversing the crankshaft, and has the excellent effect of simplifying the configuration for obtaining circular stitches and reducing costs.

[Brief explanation of the drawing]

Figure 1 is a plan view showing the main parts of a cycle sewing machine that embodies this idea, Figure 2 is a sectional view taken along the line ■-■ in Figure 1, and Figure 3 is an enlarged view taken along the line ■-■ in Figure 1. Cross section, 4th
5 and 5 are plan views showing the operating states of the main parts, and FIG. 6 is a plan view showing the main parts of a conventional cycle sewing machine. Bed surface 1, cloth support plate 2, presser arm 3, needle 4, first, second
supports 5, 6, first outer holding plate 11, positioning plate 12
, intermediate body 16, intermediate press plate 17, tension spring 18, engaging body 20, work cloth C1 sewing piece 0

Claims (1)

[Scope of Claim for Utility Model Registration] A presser arm 3 that is moved back and forth and left and right with respect to the vertical movement path of the needle 4 on the bed surface 1 together with the fabric support plate 2 on which the work cloth C is placed; On the other hand, a pair of supports 5 and 6 are each supported so as to be movable up and down, and it is attached to one support 5 of the pair of supports,
In addition, it presses the work cloth C against the cloth support plate 2 and engages with the outer periphery of a sewing piece W such as a label/name to be sewn onto the work cloth C to position the sewing piece W. an outer retaining plate 11 provided with positioning portions 11a and 12b for the purpose of the present invention; It is attached to the other end of the intermediate body 16, and the sewing piece W is attached to the bed surface 1 by the downward movement of the other support body 6.
an intermediate presser plate 17 for pressing against the sewing piece W; the intermediate presser plate 17 is formed to be similar to the sewn piece W and smaller than it by at least a seam allowance; and the other support member. 6 and the front intermediate body 16, and one side of the intermediate body 16 that crosses the peripheral portion of the sewing piece W on the outer periphery of the intermediate presser plate 17 at the start of sewing is adjacent to the vertical movement path of the needle 4. In the vicinity of the vertical movement path of the needle 4, there is a gap between the spring 1B acting on the intermediate presser plate 17 and the acting position on the movement path of the intermediate body 16 and the non-acting position outside the path. The retaining part body 20 is movably arranged and is placed in the working position during sewing, and the engaging part body 20 is attached to the outer periphery of the intermediate presser plate 17 in the state in which it is placed in the working position. After the formation of the annular seam along the outer periphery of the intermediate pressing plate 17, when the formation of the seam progresses to the other side of the intermediate body 16 that crosses above the peripheral portion of the sewn piece W on the outer periphery of the intermediate presser plate 17, the intermediate body 16 and the spring 18 is engaged between the intermediate body 16 and the other support body 6.
The sewing machine is configured to cause relative movement against the action of the sewn piece W, and to form a stitch formed on the sewing piece W into a closed annular stitch.