JP2003175289A - Post type sewing machine - Google Patents

Abstract

(57) [Problem] To provide a post-type sewing machine capable of reducing the size of a lower feed mechanism and simplifying the configuration, realizing accurate feed, and facilitating replacement of a lower feed belt. SOLUTION: A shuttle drive motor 31 for driving a shuttle provided separately from a sewing machine motor for driving a needle is provided, and an input side belt pulley 15 is disposed substantially vertically below an output side belt pulley 35.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a post type sewing machine, and more particularly to a post type sewing machine having a lower feed mechanism that feeds a sewn product by running a lower feed belt.

[0002]

2. Description of the Related Art Conventionally, a post-type sewing machine used for three-dimensional sewing such as sleeve attachment and a bag is known as a type of industrial sewing machine used for sewing sewn products such as cloth and leather.

In such a post-type sewing machine, the distance between the sewing machine bed and the sewing machine arm is formed long, and the sewing machine bed is fixed so as to stand the shuttle shaft stand, and the shuttle is arranged above the shuttle shaft base. Has been done. Further, the shuttle shaft base is provided with a lower feed mechanism for conveying the sewn product in the sewing direction. This lower feed mechanism has a lower feed belt for feeding a conveyed product, and the lower feed belt includes an output side belt pulley rotatably supported on the upper portion of the shuttle shaft base, and the output side belt pulley. It is wound around an input side belt pulley which is arranged below with a space. The output side belt pulley is rotatably arranged on the shuttle shaft base near the needle drop position.

By the way, the rotary hook is driven by using the rotation of a lower shaft disposed inside the sewing machine bed as a drive source. The rotary shaft of the lower shaft is rotated between the rotary hook and the lower shaft. There is provided a rotation transmission mechanism for transmitting the power to the gear, for example, a belt transmission mechanism including a pair of pulleys and a shuttle belt wound between the pulleys. Therefore, it is necessary to arrange the belt drive motor, the input side belt pulley, and the lower feed belt of the lower feed mechanism at positions that do not interfere with the lower shaft and the shuttle belt. Therefore, a belt driving motor or the like is arranged at a position where it does not interfere with the lower shaft.

In such a structure, the input side belt pulley cannot be directly driven by the belt driving motor, so that the driving force of the belt driving motor interferes with the lower shaft via the intermediate belt transmission mechanism. It transmits to the intermediate shaft arranged at the position not to rotate, and the rotational driving force of this intermediate shaft is
The lower feed belt is run by transmitting it to the input side belt pulley arranged on the intermediate shaft.

With this structure, the lower feed belt is
The sewn product can be fed along the sewing direction by running while holding the sewn product between the upper feed roller or the upper feed belt of the upper feed mechanism.

[0007]

However, in the lower feed mechanism of the conventional post-type sewing machine described above, the driving force of the belt drive motor is transmitted to the lower feed belt via the intermediate belt transmission mechanism and the intermediate shaft. However, since the transmission distance becomes long, the response of the lower feed belt to the rotation of the belt driving motor is delayed, and there is a problem that accurate feeding cannot be realized.

Further, since the lower feed belt and the belt of the intermediate belt transmission mechanism are provided as two belts, the number of parts is large and the construction becomes complicated. At the same time, it is necessary to replace the two belts when exchanging the belt. There was a problem that the replacement work was time-consuming.

Further, since it is necessary to dispose the belt driving motor at a position where it does not interfere with the lower shaft, there is a problem that the sewing machine becomes large.

Further, although an opening is usually provided on the belt side surface of the shuttle shaft base for replacing the lower feed belt,
In the conventional sewing machine, the belt drive motor is disposed below the lower shaft because it is provided at a position where it does not interfere with the lower shaft, and thus it is fixed to the output shaft of the belt drive motor. Since the pulley of the intermediate belt transmission mechanism is also arranged below the lower shaft, it is fixed to the output shaft of the belt drive motor when the belt of the intermediate belt transmission mechanism is replaced at the same time as the lower feed belt. There was a problem that the workability was poor because the pulley could not be visually inspected and the belt had to be replaced by hand.

The present invention has been made in view of this point, and it is possible to reduce the size of the lower feed mechanism and to simplify the structure to realize accurate feeding, and at the same time, to facilitate the replacement of the lower feed belt. The purpose is to provide a sewing machine.

[0012]

In order to achieve the above-mentioned object, the feature of the post type sewing machine of the present invention according to claim 1 is that the arm support portion for supporting the sewing machine arm is arranged at the base end side. The sewing machine bed, the shuttle shaft stand that is erected on the sewing machine bed and has the shuttle above, the output side belt pulley rotatably supported on the upper part of the shuttle shaft base, and the output belt pulley below the output side belt pulley. An input side belt pulley arranged at a distance, a lower feed belt wound between the output side belt pulley and the input side belt pulley, and a belt drive motor for rotating the input side belt pulley. A post-type sewing machine configured to rotate the lower feed belt with the driving force of the belt drive motor and to feed the sewn product with the lower feed belt above the output side belt pulley,
It has a shuttle driving motor for driving a shuttle provided separately from the sewing machine motor for driving the needle, and the input side belt pulley is arranged substantially vertically below the output side belt pulley. By adopting such a configuration, the lower feed belt can be easily replaced, the configuration of the lower feed mechanism can be simplified and downsized, and accurate feed can be realized. be able to.

The feature of the post type sewing machine of the present invention according to claim 2 is that in the claim 1, the shuttle drive motor is
The center of rotation of the output shaft of the shuttle drive motor is arranged so as to substantially coincide with the center of rotation of the shuttle. By adopting such a structure, the lower feed belt can be replaced more easily, the structure of the lower feed mechanism can be further simplified and downsized, and more accurate feeding can be performed. Can be realized.

[0014]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described below with reference to the embodiments shown in the drawings.

FIG. 1 shows a main part of an embodiment of a post-type sewing machine according to the present invention. A sewing machine frame 2 of a post-type sewing machine 1 of this embodiment has a sewing machine bed 3 arranged at a lower portion thereof. An arm support portion 4 is provided upright on the base end side BS located on the right side of FIG. 1 on the upper surface of the sewing machine bed 3. A sewing machine arm 5 extending in parallel to the sewing machine bed 3 is formed on the upper left side of the arm support portion 4 so as to extend toward the tip side TS shown on the left side of FIG. 1, and the sewing machine frame 2 as a whole. The front surface is formed in a substantially inverted U shape. Therefore, the sewing machine bed 3 has the base end side B
An arm support portion 4 that supports the sewing machine arm 5 is provided at S. The sewing machine frame 2 is integrally formed by casting or the like.

A needle (not shown) is arranged at a desired position on the lower surface of the free end called the sewing machine head located on the tip side TS of the sewing machine arm 5 as is known. This needle is attached to a known needle bar, and this needle bar is interlocked with the rotation of an upper shaft rotatably driven by a sewing machine motor (not shown) rotatably arranged inside the sewing machine arm 5. A needle bar drive mechanism (both not shown) allows reciprocating motion with a predetermined stroke in the vertical direction.
Further, at a desired position of the free end of the sewing machine arm 5, an upper feed belt 6 which forms a part of an upper feed mechanism for feeding a sewn product in cooperation with a lower feed belt 36 of a lower feed mechanism 37 described later. Is wound around an upper feed pulley that is vertically movable. Further, on the tip side TS on the upper surface of the sewing machine bed 3,
A shuttle shaft base 7 is erected.

Next, the construction of the shuttle shaft base 7 of this embodiment will be specifically described with reference to FIGS. 2 to 6.

As shown in FIG. 2, the shuttle shaft base 7 of the present embodiment.
Has a flat plate-shaped mounting base 8 that extends in the horizontal direction, is placed on the upper surface of the sewing machine bed 3 from above, and is fixed by screws (not shown). On the side surface of the tip side TS of the mounting base 8, a narrow flat plate-shaped belt motor mounting portion 9 extending downward along the thickness direction of the mounting base 8.
Is provided. A pair of flat plate-shaped support plate portions 1 that are parallel to each other are provided on both end edges in the width direction of the belt motor mounting portion 9.
0a and 10b are formed to extend so that the tips in the width direction thereof project toward the tip side TS. The upper ends of these support plate portions 10 a and 10 b project above the sewing machine bed 3. That is, each support plate portion 10a,
10b is arranged with its length direction oriented vertically. Further, on the upper surface of the mounting base portion 8, a thread trimming motor mounting portion 11 formed in a substantially rectangular frame shape is erected with the inner hole of the mounting portion 11 horizontal, and the upper portion thereof has a substantially cylindrical shape. The shuttle motor mounting portion 12 thus formed is arranged with its axial direction horizontal. This shuttle shaft base 7 is generally made of a casting or the like.

The belt motor mounting portion 9 is arranged inside the sewing machine bed 3 through an opening (not shown) formed on the upper surface of the sewing machine bed 3 (FIG. 3). Then, on the surface of the base end side BS of the belt motor mounting portion 9, the belt drive motor 13 is turned by an output shaft (not shown) toward the front end side TS by a belt motor fixing screw 14 (only part is shown). It is fixed. An input side belt pulley 15 is fixed to the output shaft of the belt driving motor 13. For this reason, a pulley through hole 16 having a size that penetrates in the thickness direction and allows the input side belt pulley 15 to pass therethrough is provided in the lower portion of the belt motor mounting portion 9. Therefore, the input side belt pulley 15 is configured to be directly driven to rotate by the belt driving motor 13.

BS on the base end side of the thread trimming motor mounting portion 11
As shown in FIG. 4, a thread cutting drive motor 17 such as a stepping motor capable of rotating in the forward and reverse directions is provided with a thread cutting motor fixing screw 18 with its output shaft 17a directed toward the tip side TS.
It is fixed by (partially shown). A base end portion of a thread cutting drive link 19 formed in a substantially bell crank shape is fixed to a tip end portion of an output shaft 17a of the thread cutting drive motor 17. The lower end of a thread cutting operation link 20 formed in a substantially flat plate is pivotally attached to the tip of the thread cutting operation link 19, and the thread cutting operation link 20 is connected.
The upper end portion of is attached to the surface of the tip side TS of the movable blade support ring 21 formed in a substantially cylindrical shape. The movable blade 22 is attached to the surface of the movable blade support ring 21 on the tip side TS. That is, the movable blade 22 is rotated by the driving force of the thread cutting drive motor 17 to move the fixed blade 23.
The thread connected to the sewing article can be cut in cooperation with the sewing machine. Further, the fixed blade 23 is fixed to the shuttle housing 24, and the shuttle housing 24 is provided inside the shuttle housing fixing screws 25 inside the facing surfaces near the upper ends of the pair of support plate portions 10a and 10b. (Fig. 2
(Only part of which is shown).

By the thread cutting drive motor 17, the thread cutting drive link 19, the thread cutting operation link 20, the movable blade support ring 21, the movable blade 22 and the fixed blade 23, the thread which is connected to the sewn product after the sewing of this embodiment is performed. A thread cutting means 26 for cutting the yarn is configured. FIG. 5 shows the shuttle headstock 7 with the thread cutting means 26 attached.

Returning to FIG. 2, on the surface of the base end side BS of the shuttle motor mounting portion 12, a shuttle drive motor 31 as a shuttle drive means is fixed with the output shaft 31a of the shuttle motor 31 toward the tip side TS. It is fixed by screws 32. At the tip of the output shaft 31a of the shuttle driving motor 31, a full-rotary shuttle 3 which is a shuttle rotatably supported inside the shuttle housing 24.
3 is fixed. That is, the shuttle drive motor 31 as the shuttle drive means for driving the shuttle on the shuttle shaft base 7 is provided separately from the sewing machine motor that vertically moves the needle bar that supports the needle.

The base side B of the outer peripheral surface of the shuttle housing 24
A needle hole 34 is formed in the upper part of S by a through hole penetrating in the thickness direction
The output side belt pulley 35 is rotatably supported on the surface of the tip side TS from the needle hole 34. A lower feed belt 36 for feeding a sewn product is wound between the output side belt pulley 35 and the input side belt pulley 15. Examples of the lower feed belt 36 include a toothed belt, a flat belt, a V belt, and the like. In the present embodiment, the toothed belt is used for the reason that there is no slip or speed change. Therefore, toothed belt pulleys are used as the input side belt pulley 15 and the output side belt pulley 35.

Therefore, the input side belt pulley 15 of this embodiment is arranged at a distance from the output side belt pulley 35, and at the same time, the output side belt pulley 35.
Is disposed inside the sewing machine bed 3 located vertically below the sewing machine bed 3.

The belt feed motor 13, the input side belt pulley 15, the output side belt pulley 35 and the lower feed belt 36 are used to feed the sewing material arranged on the shuttle shaft base 7 of the present embodiment. A lower feed mechanism 37 including 36 is configured.

An upper part of the tip side TS of the shuttle housing 24 is cut out in a circular cutout shape, and an internal circular hook stopper 39 formed in a circular cutout shape is fixed to this portion by a screw 39a. Further, a shuttle cover 40 is fixed to the front end surface of the shuttle housing 24 with a screw 40a.

The tension of the lower feed belt 36 can be adjusted by a tension adjusting means 41. The tension adjusting means 41 in the present embodiment includes a flat plate-shaped link plate 42, rollers 43 rotatably arranged at both ends of the link plate 42, and a link support body 44 formed in a substantially cylindrical shape. And a link fixing screw 45. Then, the tip end of the link fixing screw 45 is passed through a through hole (not shown) formed in the central portion in the longitudinal direction of the link plate 42 and the inner hole of the link support body 44 in this order, and then the belt motor mounting portion 9 The tension adjusting means 41 is fixed to the upper part of the surface of the tip side TS of the belt motor mounting portion 9 of the shuttle shaft base 7 by being screwed into the upper part of the surface of the tip side TS. Further, by controlling the mounting angle, which is the rotation angle of the link plate 42, the portions of the outer peripheral surfaces of the rollers 43 facing each other sandwich the substantially central portion of the lower feed belt 36 in the longitudinal direction from the outside. The lower feed belt 36 is provided with appropriate tension.

Therefore, by loosening the link fixing screw 45 and changing the mounting angle of the link plate 42, the contact force of each roller 43 with respect to the lower feed belt 36 is changed, thereby adjusting the tension with respect to the lower feed belt 36. Is able to.

The length of the link plate 42 in the longitudinal direction is
It is formed to be shorter than the distance between the pair of support plate portions 10a and 10b.

A pair of support plate portions 10a, 1 of the shuttle shaft base 7
0b, as shown in FIG.
The belt cover 46 that covers the surface of the front end side TS of the portion of the sewing machine bed 3 exposed on the upper surface of the sewing machine bed 3 is a cover fixing screw 47.
Is stuck by. That is, the lower feed belt 3 is attached to the side surface of the shuttle headstock 7 located on the tip side TS of the sewing machine bed 3.
A belt cover 46, which is formed in a U-shape when viewed from above, is detachably disposed so as to cover 6. A cloth guide 48 having an opening 48a for exposing the upper portion of the lower feed belt 36 and the needle hole 34 is attached to the upper end of the belt cover 46, and the sewing material is placed on the upper surface of the cloth guide 48 during the sewing operation. The sewn product is sandwiched between the lower feed belt 36 and the upper feed belt 6 and fed inside the opening 48a of the cloth guide 48.

It is exposed above the sewing machine bed 3 of the shuttle shaft base 7 and is located at the base end side B from the support plates 10a and 10b.
As shown in FIGS. 1 and 6, the portion located at S is covered with a safety cover 49, which is configured to ensure the safety of the worker.

The other construction is the same as that of the conventional post-type sewing machine, and a detailed description thereof will be omitted.

In the present embodiment, the input side belt pulley 15 is arranged inside the sewing machine bed 3 which is vertically below the output side belt pulley 35, and
The belt driving motor 13 is provided on the base end side BS of the sewing machine bed 3.
Although it is arranged on the side of the input side belt pulley 15 located at, a shuttle driving motor 31 as a shuttle driving means for driving the fully rotating shuttle 33 as a shuttle is separately provided on the shuttle shaft base 7. Since it is provided, for example, the belt driving motor 1
3 can be arranged above the sewing machine bed 3 beside the shuttle headstock 7 or the like. In this case, the arrangement of the input side belt pulley 15 may be set according to the arrangement position of the belt driving motor 13. However, the input side belt pulley 15 is
It is important that the lower feed belt 36 feeds the sewn product by arranging it below the output side belt pulley 35 with a gap.

Next, the operation of this embodiment having the above-mentioned structure will be described.

The replacement operation of the lower feed belt 36 in the post type sewing machine 1 of this embodiment is performed by a belt removing operation of removing the lower feed belt 36 used from the post type sewing machine 1 and a new lower movement of the post type sewing machine 1. The belt attaching operation for attaching the feed belt 36 is executed in this order.

One belt removing operation is performed by the belt cover 4
It starts by removing the cloth guide 48 mounted on the upper part of 6. Then, the cover fixing screw 47 is loosened and removed, and then the belt cover 46 is removed from the shuttle shaft base 7.

Then, the link fixing screw 45 forming a part of the tension adjusting means 41 is loosened. Then, the link plate 42 is automatically rotated by the tension applied to the lower feed belt 36 so as to be horizontal, and as a result, the tension applied to the lower feed belt 36 is released and the input side is released. The lower feed belt 36 wound between the belt pulley 15 and the output side belt pulley 35 is loosened. Alternatively, the link plate 42 may be operated so as to be forced to be horizontal. Then, with the lower feed belt 36 being loose, the lower feed belt 3
When 6 is moved to the tip side TS, the lower feed belt 36
Input side belt pulley 15 and output side belt pulley 35
Get out of. At this time, since the belt driving motor 13 is fixed to the surface of the base end BS of the belt motor mounting portion 9 which is the side located on the base end BS of the input side belt pulley 15, the input side belt pulley 15 There is nothing that interferes with the lower feed belt 36 that separates from the pulleys 15,
It is possible to easily remove the lower feed belt 36 from the 35. Then, when the lower feed belt 36 is moved above the sewing machine bed 3, the removal of the lower feed belt 36 from the post type sewing machine 1 is completed.

Since the other belt attaching operation is executed in the reverse procedure of the belt removing operation, its detailed description will be omitted.

As described above, according to the post-type sewing machine 1 of the present embodiment, since the shuttle drive motor 31 for driving the shuttle is provided separately from the sewing machine motor for driving the needle, the inside of the sewing machine bed 3 Since it is not necessary to dispose a conventionally known lower shaft, and the belt driving motor 13 can be disposed without being aware of the lower shaft, the input side belt pulley 15 is disposed vertically below the output side belt pulley 35. Moreover, it can be disposed close to the output side belt pulley 35. As a result, when the lower feed belt 36 is replaced, the belt opening 4
Since the replacement work can be performed while visually checking the input side belt pulley 15 from 8a, the lower feed belt 36 can be easily replaced. Further, since the input side belt pulley 15 and the output side belt pulley 35 can be arranged close to each other, the transmission distance of the driving force is shortened, and the input side belt pulley 1 for the rotation of the belt driving motor 13 is reduced.
5, that is, the responsiveness of the lower feed belt 36 is improved, so that accurate feed can be realized. Further, since it is not necessary to be aware of the lower shaft, it is not necessary to dispose the belt driving motor 13 at a position where it does not interfere with the lower shaft, and therefore the sewing machine can be downsized.

Particularly, the post-type sewing machine 1 of the present embodiment is
Since the center of rotation of the output shaft 31a of the shuttle driving motor 31 is arranged to coincide with the center of rotation of the shuttle, that is, the shuttle driving motor 31 is arranged near the upper part of the shuttle shaft base 7. Since the belt driving motor 13 and the input side belt pulley 15 can be arranged near the upper part of the shuttle shaft base 7, that is, the output side belt pulley 35, the lower feed belt 36 can be replaced more easily, and , More accurate feeding can be realized.

Further, the conventional lower feed mechanism of the post-type sewing machine is configured to have two belts, that is, the lower feed belt and the belt of the intermediate belt transmission mechanism, but in the present embodiment, only the lower feed belt 36 is provided. Since it is composed of one belt, the belt replacement operation is facilitated and the number of parts can be reduced. By reducing the number of parts, it is possible to simplify the configuration of the lower feed mechanism and easily realize downsizing.

The present invention is not limited to the above embodiment, but can be variously modified as necessary.

[0043]

As described above, according to the post type sewing machine of the present invention according to claim 1, the lower feed belt can be easily replaced, and the structure of the lower feed mechanism can be simplified and downsized. It is also possible to achieve an extremely excellent effect such that accurate feeding can be realized.

According to the post type sewing machine of the second aspect of the present invention, the lower feed belt can be replaced more easily, and the structure of the lower feed mechanism can be further simplified and downsized. In addition, it is possible to realize a more excellent effect such as more accurate feeding.

[Brief description of drawings]

FIG. 1 is an external perspective view showing a main part of an embodiment of a post-type sewing machine according to the present invention.

FIG. 2 is a partially exploded enlarged perspective view showing a main part of a shuttle headstock of the post-type sewing machine of FIG.

FIG. 3 is an enlarged perspective view showing a state in which a shuttle shaft mount is attached to a sewing machine bed of the post-type sewing machine of FIG.

4 is a partially exploded enlarged perspective view showing a main part of the thread cutting means of the post-type sewing machine of FIG.

FIG. 5 is an enlarged perspective view showing a state in which thread cutting means is attached to the shuttle headstock of the post-type sewing machine of FIG.

FIG. 6 is an enlarged exploded perspective view showing a state in which a belt cover is attached to a shuttle headstock of the post-type sewing machine of FIG.

[Explanation of symbols]

1 Post type sewing machine 2 sewing machine frame 3 sewing machine beds 7 shuttle shaft 8 mounting base 9 Belt motor mounting part 11 Thread trimming motor mounting part 12 hook motor mounting part 13 Belt drive motor 15 Input side belt pulley 17 Thread trimming drive motor 24 hook housing 26 Thread cutting means 31 hook drive motor 33 full rotary hook 35 Output side belt pulley 36 Lower feed belt 37 Lower feed mechanism 41 Tension adjusting means 46 Belt cover BS proximal side TS tip side

Claims (2)

[Claims] 1. A sewing machine bed in which an arm supporting portion for supporting a sewing machine arm is provided on a base end side, a shuttle shaft stand which is erected on the sewing machine bed and has an upper shuttle, and an upper part of the shuttle shaft base. An output side belt pulley that is rotatably supported on the output side belt pulley, an input side belt pulley that is arranged below the output side belt pulley at a distance, and a winding between the output side belt pulley and the input side belt pulley. The rotating lower feed belt and a belt drive motor for rotating the input side belt pulley are provided, and the lower feed belt is rotated by the driving force of the belt driving motor to move above the output side belt pulley. A post type sewing machine configured to feed a sewn product by a lower feed belt has a hook drive motor for driving the hook, which is provided separately from a sewing machine motor for driving a needle, Post-type sewing machine, characterized in that arranged in a substantially vertical direction below the output side belt pulley and Topuri. 2. The shuttle drive motor is arranged such that the center of rotation of the output shaft of the shuttle drive motor is substantially coincident with the center of rotation of the shuttle. Post-type sewing machine described.