JPS61390A - Drive apparatus of sewing apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a driving device for a movable knife in a cloth cutting device that is used in an overlock sewing machine.

[Conventional technology and its problems]

Overlock sewing machines often perform overlock stitches on fabric, so the edges of the fabric are trimmed just before they are stitched so that the area where the sewing machine needle pierces and the edge of the fabric always have a constant size. For this reason, a fixed knife and a movable knife are installed in the presser foot of the sewing machine, and the knife is used to make the same cuts once.Generally, the movable knife is fixed to the elevating section, which is cut straight at the bottom of the sewing machine bed. It can be raised and lowered freely, and this
Q = As a connecting means of the swinging part paulownia that drives the part shrine and the core part 8, it operates integrally in the same direction as the axis of the elevating shaft of the elevating member, and can slide freely in the direction crossing the axis. By connecting to the movable knife and the fixed knife attached to the elevation part (Δ), the vertical movement of the elevation member is smoothed, and a cutting action is performed between the movable knife and the fixed knife attached to the elevation part (Δ).

By the way, in the above cutting action, lifting rs1s 4:
It is necessary to prevent 4 from rotating inadvertently.

Therefore, as shown in the specification and drawings of U.S. Patent No. 1.223718 and shown in FIG. 7, a conventional device has been proposed in which the elevating member 52 is supported on two guide rods 51J and 51 to prevent its rotation. being done.

However, in this conventional example, the movable knife 53 fixed to the elevating section b2 cannot be rotated about the guide rod 50.51. For this reason, it is not possible to adjust the parallelism between the movable knife 53 and the fixed knife.
It is necessary to manufacture the fitting between the guide rods 50 and 51 with high precision.

[Purpose of the invention]

With the above points in mind, it is an object of the present invention to provide a knife drive device that can prevent the rotation of the elevating part during cutting i'F and can adjust the parallelism of both knives.

[Means to achieve the purpose]

In order to achieve the above object, the present invention provides a fabric cutting device that cuts the edge of the fabric that is about to be sewn using a fixed knife attached to a sewing machine bed and a movable knife that moves in conjunction with the main shaft. 6ゝ'y 7 ic b Ll' with
T. A pushing rod that swings in conjunction with the main shaft and a lifting member for facing the movable knife are connected, and the lifting section is rotatably and freely raised and lowered on a knife holder provided at the bottom of the sewing machine bed. A guide pin is attached to the female holder in parallel with the direction in which the elevating part 44 is raised and lowered, and a guide is rotatably and attachably attached to the elevating part 44 and allows the guide pin to slide in a fitted state. A means for limiting the elevating part 1 is provided.

[Effect]

The knife l drive device configured in this manner adjusts the parallelism of the movable knife and the fixed knife by rotating the elevating section, and then fixes the guide section 44 to the elevating section or O with screws or the like. , rotation of the elevating section is prevented by the engagement of the guide pin and the guide member. That is, the adjusted state is maintained and cutting fβ is performed by both knives as in the conventional case.

〔Example〕

Embodiments of the present invention will be described below with reference to the accompanying drawings.

In the figure, 1 is a sewing machine bed, and 2 is a throat plate attached to this bed 1. 3 is a presser foot fixed to the lower end of a presser bar deposited on a sewing machine arm (not shown) on the upper part of the bed 1, and 4 is a sewing machine needle fixed to the lower end of a needle bar (also not shown).

Further, a main shaft 5 is attached to the lower part of the bed 1 and rotates continuously in the same direction as the sewing machine is operated, so that the lower mechanism of the sewing machine is controlled by the main shaft 5.

Reference numeral 6 denotes a push rod whose part is pivoted by a shaft 7 to a bearing fixed to the lower part of the bed 1. One end of this push rod 6 is connected to a connecting rod 8.
The lower end of the connecting rod 8 is pivoted, and the annular portion 9 formed at the upper end of the connecting rod 8 is fitted onto the eccentric disc 10 fixed to the main shaft 5.
As the lever rotates, the connecting rod 8 moves up and down, causing the pushing rod 6 to swing 1 around the shaft 7.

11 is a mounting base 14 fixed at the bottom of bed 1, and this base 1
A fixing knife 12 is fitted into a horizontal hole formed in the upper part of the knife 1 and fixed with a screw, and a fixing knife 14 is also fixed to the outer surface of the bone parts 1' and 3 at the tip of the knife 12. A hoistaku member A is arranged below the knife 14.

This part I/IA consists of a vertical axis 15 and a female mounting part 16 integrally attached to the upper end of the field 15.
ing. The female holder 17 forms a pivot 19 at one end, and the pivot 1! -j is slidably and rotatably inserted into a cylinder 18 which is fitted and fixed in a horizontal hole provided in the mounting base 11 parallel to the shaft 12. The pivot 19 has a collar 20
are fixed with screws, and a spring 21 is installed between the end surface of the collar 20 and the inner end surface of the tube 18 to constantly press the pivot 19 and the single female holder 17 backward.

Reference numeral 22 denotes a movable scalpel whose lower end fits into a groove formed on the side surface of the mounting section 16 and is adjustable and fixed to the mounting section 16 with a tightening screw 23. The spring 21 makes elastic contact with the cutting edge 2b of the +'+i+ recording and fixing knife 14 at a predetermined pressure of 'j141.

The lower end of the lifting shaft 15 protrudes from the lower part of the scalpel holder 17 and is slidably fitted into a vertical hole provided in the guide member 26. The guide portion ↑426 is provided with a shaft 27,
The shaft 2γ fits into a horizontal hole formed at the top end of the mounting base 11 and is fixed with a screw 27.

Further, a protruding part 28 is formed at the lower end of the female holder 17, a guide pin 29 parallel to the elevating shaft 15 is fixed to the protruding part 28, and this pin 29 is attached to a guide member 30 fixed to the elevating shaft. It is slidably fitted into the formed vertical hole. This guide member 30 is rotatably fitted onto the elevating shaft 15 and fixed with a screw 30'. is rotatably fitted on the outside, and the slider 1.32 is slidably fitted into the forked member 3 formed at the end of the push rod 6.

The embodiment has the above configuration, and when the main shaft 5 continuously rotates in a fixed direction as the sewing machine operates, the connecting rod 8 moves up and down.
The push rod 6 swings. Therefore, the slider 32 in the bifurcated part 3 moves up and down together with the lifting shaft 16, and the movable knife 22 at its upper end rises, and the edge of the cloth is moved between the cutting edge 25 of the fixed knife 14 and the movable knife 22. Cut with the cutting edge 24.

In the above operation, the lifting part, 0' A lifting @ 15 force, is fitted into the vertical hole of the knife holder 17 rotatably attached to the mounting base 11 at the bottom of the sewing machine bed, but the lifting shaft The guide pin 29 provided on the protruding portion 28 of the female holder 17 is slidably fitted into the vertical hole of the guide portion 30 to prevent the female holder from rotating around the axis of the female holder 15 . That is, the core @30 is fixed to the lifting shaft 16, and the guide pin 29 is fixed to the protrusion 28 of the knife holder 17, which does not rotate around the axis of the lifting shaft 15. The rotation of the lifting shaft 15 is controlled by the pin 29.
It will be L.

In addition, for guiding the elevating shaft 15 and the guide pin 29,
The vertical holes provided in the guide member 26 and the guide member 30 have the same function and effect even if they are replaced with vertical grooves with one side open as shown in Figures 5 and 6.
It goes without saying that the guide pin 29 on the side and the guide member 30 on the elevating shaft 15 side may be reversely configured.

Also, the parallelism of the fixed knife 14 and the movable knife 22 is l+IA
When I@, loosen the screw 30, rotate the lifting shaft 15, and tighten the screw 30 in an optimal state to fix the lifting shaft 16 to the guide member 30.

〔Effect of the invention〕

Since this invention is configured as described above, the parallelism of both knives can be adjusted by rotating the lifting member, and the degree of adjustment can be maintained by fixing the lifting part ladle to the guide member with screws or the like. At the same time, rotation of the elevating member can be prevented. Therefore, according to the present invention, the above object can be achieved with a simple configuration.

[Brief explanation of drawings]

Fig. 1 is a partially longitudinal sectional side view of the device of the present invention, Fig. 21 is a longitudinal sectional front view of the same as above, Fig. 3 is a longitudinal sectional view of the lifting shaft kite section, and Fig. 4 1 is a narrow lIJ' of the guide pin guide section. 5 and 6 are cross-sectional views of the improved device, and FIG. 7 is a perspective view of essential parts of a conventional knife drive device. DESCRIPTION OF SYMBOLS 1... Sewing machine bed, 5... Main shaft, 14... Fixed knife, 15... IL shaft, 17... Knife holder, 22
...Moving knife, 2...Guide part 1, 29...Guide pin, JO...Guiding member, A...Lifting part. Figure 1 Figure 2 Figure 3 Broom 41 Figure 5 6 C1 Figure 7 Procedural amendment (drunk) Showa 60;i, April 2611 Showa eiO Permanent Application No. b87b6 Tsubasa-28 Name of invention in sewing machine Relationship between knife drive device 3 and the case of the person making the correction Permit issued IQji Person address 2-24 Satahigashi-cho, Moriguchi City Name analysis +
(6251 Maruzen Min Co., Ltd. Name (7420)
7FJ! l: 10 sickles Ell sentence -7'l'Jf
r1 fire 1i1y, 06 (f+31) 0021 (
1('+!i)1:i □□'1. Showa f1゛ Month 111
116 Contents of amendment of the number of inventions to be increased by amendment 1. As shown in the attached sheet, the "claims" of the present application will be amended. -2.The entire statement box 2 purchase will be corrected as follows. [[Prior art and its problems] Overlock sewing machines often perform overlock stitches on the edges of fabric, so when the edge of the fabric is just about to be formed, the edge of the fabric is trimmed and the part where the sewing machine needle pierces is always aligned with the edge of the fabric. It is made to have a certain size. For this reason, as shown in Figures 1 and 2,
A fixed knife 14 and a movable knife 22 are attached to the presser foot 3 of the sewing machine.
Generally, an elevating member A to which a movable knife 22 is fixed is movable linearly at the bottom of the sewing machine bed 1, and the elevating member A
As a connecting means for the swinging member 6 that drives the member A, a k is designed so that it operates integrally in the same direction as the axis of the elevating shaft 15 of the elevating member A, and is slidable in the direction transverse to the axis.
it@t6c+! : iz yo 0, wa, i. □,
□ ゛Make it smooth and perform the cutting action between the movable knife 22 attached to the elevating member A and the fixed knife 14. Conventionally, as a means for connecting the elevating member A and the swinging member 6, as shown in FIGS. One is a sliding engagement in which the shaft 31 protruding from the elevating member A is slidably fitted, and the other is a link mechanism O in which the swinging member 6 and the shaft 31 are connected by a link a as shown in Figure $8. The latter link-based connection means requires a link a compared to the former connection means (the former performs the action of link a by sliding), and has a larger number of parts. If the number increases, the production cost will increase and the adjustment will be complicated.Also, because it requires space for the link a to move, in today's world where compactness is desired, the former method of connecting by sliding engagement is The problem of space is particularly important because there is little space at the bottom of the sewing machine bed.By the way, in the cutting action mentioned above, it is necessary to prevent the elevating member A from rotating unnecessarily. Therefore, in the conventional structure in which the elevating member A and the swinging member 6 are connected by the above-mentioned sliding engagement, US Pat.
As shown in the specification and drawings of No. 71.8 and shown in Figure 7, 2
"Support the elevating member 52 on the book guide rods 50 and 51." 3. On page 3, line 10 of the same book, next to "Keep in mind the above points,"Let's leave the concatenated one L here and add J. 4. "Connection" in line 20 of the same page will be corrected to "connection by sliding engagement." 5. "Figure 5," in line 12 of page 8 of the same book will be deleted. 6 , On the 14th line of the same page, "Dere," and "Figure 5 j
Add "as shown here. 7 In the same book, page 9, line 14, "is." is 1. FIG. 8 is a schematic diagram showing an example of a means for connecting the elevating member and the swinging member. ” will be corrected. 8. Attachment Figure 8 is added to the drawings. Scope of Claims (1) A sewing machine having a fabric cutting device that cuts the edge of a fabric that is about to be sewn using a fixed knife attached to the sewing machine bed and a movable knife that operates in conjunction with the main shaft. The swinging pushing rod and the movable knife are mounted on a knife holder provided at the bottom of the sewing machine bed so that the elevating member can be rotated and freely raised and lowered, and the elevating member is mounted on the knife holder in parallel with the direction in which the elevating member moves up and down. A knife drive device for a sewing machine provided with a means for limiting an elevating member, which comprises a guide pin attached to the elevating member, and a guide member rotatably and fixedly attached to the elevating member and sliding the guide pin in a fitted state. Figure 8

Claims (1)

[Claims] (1) In a sewing machine equipped with a fabric cutting device that cuts the edge of the fabric that is about to be sewn using a fixed knife attached to the sewing machine bed and a movable knife that operates in conjunction with the main shaft, there is a pusher that swings in conjunction with the main shaft. A moving rod and an elevating member to which the movable knife is fixed are connected, and the elevating member is rotatably and movably mounted on a knife holder provided at the bottom of the sewing machine bed, and the knife holder is provided with a direction in which the elevating member moves up and down. A knife drive device for a sewing machine equipped with a means for limiting an elevating member, which comprises guide pins attached in parallel and a guide member rotatably and fixably attached to the elevating member and sliding the guide pin in a fitted state. .