KR100795652B1 - Cylindrical bed for a sewing machine - Google Patents

Abstract

In the cylinder bed of the sewing machine, it is possible to easily remove the impurities deposited on the transfer mechanism portion to improve the durability of the transfer mechanism and at the same time enable smooth sewing.

A cylinder bed which protrudes almost horizontally, a feed tooth hole is formed in the upper surface, a needle plate fixed to the cylinder bed to cover the upper end of the cylinder bed end face, and a cutout is formed in the lower face and the lower end face. And a needle plate stand fixed to the cylinder bed to cover the cylinder bed front end face, and a cover provided detachably to the needle plate stand to cover the cutout portion of the needle plate stand.

Description

CYLINDRICAL BED FOR A SEWING MACHINE

1 is an exploded perspective view of the present invention.

2 is a perspective view of the transfer mechanism of the present invention.

3 is a perspective view of a cylinder bed of the present invention.

4 is a cross-sectional view taken along line B-B in FIG. 3 according to the present invention.

5 is a perspective view of a cylinder bed tip according to the first prior art.

FIG. 6 is a view illustrating a cloth transport mechanism installed in the cylinder bed of FIG. 5.

7 is a cross-sectional view taken along the line A-A of FIG.

8 is an exploded perspective view of the end of a cylinder bed according to the second prior art;

Description of the main parts of the drawing

30: long and thin cylindrical bed (cylinder bed)

31: needle plate 34: needle plate stand

39: notch 41: cover

51: transfer table 61: transfer base

66: guide pin (guide member)

The present invention relates to a cylinder bed of a sewing machine.

As a conventional technique of a sewing machine having an elongated cylindrical cylinder bed, a configuration (first conventional example) as shown in Figs. 5 to 7 is widely known.

The needle plate 2 having the feed tooth hole 3 formed on the upper surface thereof is fixed to the bed 1 by screws 4 so as to cover an upper end portion of the cylindrical bed 1. The needle plate stem 5 is fixed to the bed 1 by screws 6 so as to cover the lower end portion of the bed 1. The bearing 7 of the lower shaft 17 mentioned later is fixed to the front end surface of the needle plate base 5 by the screw 8.

The horizontal feed shaft 9 supported by the bed 1 to be rotatable rotates in conjunction with the main shaft of the sewing machine. The horizontal transfer arm 10 has its base portion fixed to one end of the horizontal transfer shaft 9. The lower end of the feeder link 12 is fixed to one end of the point shaft 11 supported by the bed 1 so that rotation is possible.

As shown in FIG. 7, the conveyance table 13 has a groove 14 in the vertical direction at the center thereof, and both ends of the conveyance table 13 have an upper end of the horizontal conveyance arm 10 and the conveyance. The upper end of the large link 12 is connected so as to be rotated by stepped screws 15 and 16, respectively. The lower shaft 17 rotatably supported by the bed 1 and the bearing 7 rotates in association with the main shaft of the sewing machine, and an eccentric cam 18 is fixed at one end thereof.

The conveying base 19 is loosely fitted in the groove 14 of the conveying table 13 and is formed below the sliding part 20 and the sliding part 20 in which the horizontal section is T-shaped, and the eccentric cam 18 It consists of the fork part 21 loosely fitted in an outer periphery. And the sliding part 20 of the said conveyance base 19 is sliding by the two press plates 23 fixed to the side end surface of the conveyance stand 13 by the screw 22, respectively, as shown in FIG. The part 20 is supported so that it may move up and down along the groove 14. The feed tooth main body 24 is provided with the feed tooth 26 which has the needle hole 25 in the upper end. And the lower end of the transfer tooth main body 24 is the sliding portion 20 of the transfer base 19 so that the transfer tooth 26 can be released from the transfer tooth hole 3 of the needle plate (2) as shown in FIG. It is fixed to the side end surface by the screw 27.

Next, the operation of the first conventional technology described above will be briefly described.

When the sewing machine is driven and the main shaft (not shown) rotates, the horizontal feed shaft 9 shown in FIG. 6 oscillates and the lower shaft 17 rotates. By oscillating rotation of the horizontal feed shaft 9, one end of the feed table 13 connected to the upper end of the horizontal feed arm 10 swings on an arc centered on the horizontal feed shaft 9, and the feed link 12 The other end of the conveyer (13) connected to the rocking oscillates on the circular arc centered on the point axis (11), whereby the conveyer (13) reciprocates in the horizontal direction. Moreover, when the eccentric cam 18 rotates with the rotation of the lower shaft 17, the sliding part 20 of the conveyance base 19 reciprocates up and down along the groove | channel 14 of the conveyance stand 13 by it. . By the horizontal swing of the feed table 13 and the vertical swing of the feed base 19, the feed tooth 26 makes the feed movement of the cloth in the feed tooth hole 3 of the needle plate 2.

Next, a second prior art will be described with reference to FIG. 8.

The needle plate 2 is provided so as to cover an upper portion of the substantially middle portion in the longitudinal direction of the bed 1 having a cylindrical shape, and is fixed to the bed 1 by a screw 4. And the cover 28 which has the semi-cylindrical part 29 which covers the lower side of the bed 1 facing the needle board 2, and the end surface cover part 30 which covers the front end surface of the bed 1 is provided. .

In the case of removing impurities or the like deposited in the inside of the bed 1, the cover 28 is removed from the lower outer periphery of the bed 1 like a solid line, and the cover is completed when the inside of the bed 1 is cleaned. The semi-cylindrical part 29 of (28) is inserted in the bed 1 like a dashed-dotted line, and covers about half and the front end surface of the lower part of the bed 1 below.

However, these first and second conventional examples have the following problems, respectively.

In other words, when the fabric is sewn for a long time by a sewing machine, impurities such as glue or seams of the cloth fall on the transfer tooth and the transfer mechanism below the sediment when the needle penetrates the cloth. When such impurities enter the sliding part or the connecting part of the transfer mechanism, a large resistance is generated in the sliding part or the connecting part, which hinders the operation of the sewing machine, making sewing difficult, or causing the wear of the sliding part or the connecting part. (1) It is necessary to occasionally remove impurities accumulated in the transfer mechanism part therein.

In the first prior art, in order to remove the impurities deposited on the transfer mechanism part, two screws 6 and 6 which secure the needle plate stand 5 shown in FIG. 5 are loosened and separated, and the needle plate stand 5 ) Must be pulled out to the left and removed from the bed 1 together with the bearing 7.

In addition, in the above mechanism, since the bearing 7 is fixed to the needle plate stand 5, when the needle plate stand 5 is again attached to the bed 1, the needle plate stand 5 is slightly displaced. Even when fixed to the bed 1, the shaft center of the bearing 7 is fixed to the shaft center of the lower shaft 17, the torque of the lower shaft 17 is increased and the drive of the sewing machine is disturbed, so sewing A problem such as difficulty arises, and since the needle plate stand 5 must be reattached each time, there is a problem that a large amount of time is required at the time of attachment and the efficiency of the sewing operation is lowered.

In addition, in the second prior art shown in Fig. 8, the above problems of the first prior art have been solved, but the semi-cylindrical portion 29 covering about half of the lower side of the bed 1 of the cover 28 is eliminated. Since the processing must be performed precisely to coincide with the inner arc, the processing cost of the bed 1 is increased, and there is a problem that attachments used for sewing cannot be attached.

In addition, the cylinder bed of this kind is often used when sewing leather products such as shoes, in the case of the upper prior to the sole in the first prior art, the sole portion (2) And it is necessary to sew a portion near the edge of the sole by pressing the tip surface of the needle plate stem 5. Moreover, the position of the needle hole 25 from the end face of the bed 1 is difficult to change due to the relationship between the hook and the needle (not shown) incorporated in the bed 1. For this reason, it is required to shorten the distance from the needle hole 25 of the feed tooth 26 to the front end surface of the needle plate 2 and the needle plate base 5.

However, in the first conventional technology, as shown in FIG. 7, one side of the sliding portion 20 of the transport base 19 is supported by a pressing plate 23 fixed to the transport table 13. In order to satisfy the requirement to shorten the distance from the needle hole 25 of the feed tooth 26 to the distal end faces of the needle plate 2 and the needle plate stem 5, the thickness of the pressing plate 23 is increased. The thickness of the sliding part 20 of 19 must be made thin.

For this reason, in the 1st prior art, there exists a problem that the sliding part 20 of the conveyance base 19 is thin, and the sliding part 20 is easy to be worn, the durability falls, and noise is easy to generate | occur | produce.

Furthermore, in the first prior art, the depth of the groove 14 of the transfer table 13 and the thickness of the sliding portion 20 of the transfer base 19 are such that the sliding portion 20 backlashs in the groove 14. There is a problem that the machining cost is high because it needs to be precisely processed so that it can slide smoothly without.

In order to solve the above-mentioned conventional problems, the invention of claim 1 further comprises a cylinder bed extending substantially horizontally, and a needle plate having a feed tooth hole formed on an upper surface thereof and fixed to the cylinder bed so as to cover an upper side of the cylinder bed end surface. And a cutout portion is formed below the lower surface and the front end surface and is detachable to the needle plate stand to cover the cutout portion of the needle plate stand and the needle plate stand fixed to the cylinder bed to cover the lower side of the cylinder bed end face. It was configured to install the installed cover.

According to the invention as set forth in claim 1, the cover which covers these cutouts is provided so that attachment and detachment are possible with respect to the needle plate stand which has cutouts in the lower surface and the front end surface, and the following effects are acquired.

To remove the impurities deposited on the feed tooth or the transport mechanism below it, simply remove the cover from the needle plate stand, and after removing the impurities, it is enough to insert the cover into the needle plate stand. When impurities are easily removed and impurities can be removed frequently, impurities do not enter the sliding part or the connecting part of the transfer mechanism, so that large resistance does not occur in the sliding part or the connecting part, and thus, the sewing machine becomes difficult and sewing is difficult. There is no effect that the sewing work efficiency is improved. In addition, since the wear of the sliding portion and the connecting portion is reduced, there is an effect such as excellent durability.

Furthermore, since the present invention does not need to precisely process the cylinder bed, the groove of the transfer table, the sliding portion of the transfer base, etc., there is an effect that the processing cost can be reduced.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described through FIGS.

First, the appearance of the cylinder bed will be described with reference to FIG. 3. Reference numeral 30 denotes an elongated cylindrical bed (cylinder bed), 31 denotes a needle plate, which is formed by a screw 33 so that a feed tooth hole 32 is formed on an upper surface thereof and covers an upper end surface of the bed 30. It is fixed to the bed (30). 34 is a needle plate stand, and is fixed to the bed 30 by screws 35 so as to cover the front end face of the bed 30 and the lower side of the bed 30.

Next, the detailed structure is demonstrated centering on FIG.

The needle plate 31 is formed with a semicircular cutout 36 under the tip end surface. The needle plate stand 34 includes a semicircular cutout portion 37 facing the semicircular cutout portion 36 of the needle plate 31, a hole 38 below the cutout portion 37, and a needle plate stand. Covering cutouts 39 to be described below cut from the lower end surface of the 34 to the lower surface, and the inner side surfaces of both sides of the lower end of the needle plate base 34 along the longitudinal direction of the bed 30, respectively A pair of arc-shaped grooves 40 opening forward are formed.

41 is a cover, which is composed of a side portion 42 covering the lower end surface of the cutout portion 39 of the needle plate stand 34 and a bottom portion 43 covering the bottom surface thereof, both ends of which are provided at the bottom portion 43. The leaf spring 44 which enters the groove 40 of the needle plate stem 34 is fixed. The leaf spring 44 is bent when inserted into both grooves 40 to impart friction to prevent the cover 41 from vibrating or moving away from the needle plate stem 34.

45 is a horizontal feed shaft, which is rotatably supported by the bed 30 and swings in conjunction with the main shaft of the sewing machine. 46 is a horizontal feed arm, the base part of which is fixed to one end of the horizontal feed shaft 45. 47 is a support that is bent in an L shape, the base portion is fixed to the inside of the bed 30 by a screw 48, the angular tip 49 is supported at the front end to be rotatable by the stepped screw 50 have.

51 is a conveyance table, and the center part is provided with the groove 52 of the vertical direction whose cross section is U-shape. One end of the transfer table 51 is connected to the upper end of the horizontal transfer arm 46 by a stepped screw 53 so as to be rotatable, and the fork portion 54 at the other end has the angled tip. (49) is loosely fitted. 55 is a lower shaft, rotatably supported by the bed 30, and rotates in association with the main shaft of the sewing machine. 56 is fixed to the lower shaft 55 as an eccentric cam.

57 is an up-and-down shaft rotatably supported by the bed 30, and at one end thereof, the base portion of the fork arm 59, in which the eccentric cam 56 is loosely fitted, is fixed to the fork portion 58 of the distal end. The base portion of the upper and lower arms 60 is fixed.

61 is comprised from the upper sliding part 62 loosely fitted in the groove | channel 52 of the conveyance base 51, and the fork part 63 of the horizontal direction below. 2 and 4, the conveying base 61 is loosely fitted into the groove 52 of the conveying table 51, and the tip angled to the lower fork portion 63. 64 is loosely fitted, and the angular tip 64 is supported by the stepped screw 65 so as to be rotatable at the distal end of the upper and lower arms 60.

66 is a guide pin functioning as a guide member, and as shown in FIG. The sliding part 62 is guided against the side of the sliding part 62 of the base 61 so as not to move laterally, and the sliding part 62 is allowed to slide up and down. Therefore, it is possible to loosen the screw 67 to adjust the guide pin 66 to move in the axial direction.

68 is a feed tooth main body, and the feed tooth 70 which has the needle hole 69 in the upper end is formed. In addition, the transfer tooth main body 68 has a screw (above the side end surface of the transfer base 61 in the state where the feed tooth 70 protrudes from the feed tooth hole 32 of the needle plate 31 as shown in FIG. 72). 71 is a stopper pin embedded in the conveying base 61, and prevents the feed tooth main body 68 from falling more than necessary when the screw 72 is loosened. Reference numeral 73 in FIG. 3 denotes an attachment attachment boss installed on the side of the bed 30.                     

The guide pin 66 which functions as a guide member is not necessarily limited to a pin, and may be another shape, and also the place where the said guide body is provided may be a place other than the needle plate stand 34.

Next, the operation will be described.

 In driving the sewing machine, the cover 41 inserts both ends of the leaf spring 44 into the grooves 40 and 40 of the needle plate stand 34 as shown in FIG. By sliding and sliding in the longitudinal direction of the bed 30, the cover 41 covers the notch 39 below and below the front end surface of the needle plate base 34. As shown in FIG.

When the sewing machine is driven to rotate the main shaft (not shown), the horizontal feed shaft 45 shown in FIG. 2 oscillates and the lower shaft 55 rotates. As a result, first, when the horizontal feed shaft 45 swings, one end of the feed tray 51 swings in an arc shape around the horizontal feed shaft 45 together with the upper end of the horizontal feed arm 46, and the feed tray 51. The fork portion 54 at the other end slides with respect to the angled tip 49 while slightly rotating the angled tip 49, whereby the carriage 51 reciprocates in the horizontal direction.

Moreover, when the lower shaft 55 rotates, the upper and lower shafts 57 reciprocate and swing by the eccentric cam 56 via the fork arm 59, and furthermore, the conveying base through the upper and lower arms 60 and the angled tip 64. The sliding part 62 of 61 moves up and down in the groove | channel 52 of the feed stand 51. As shown in FIG. Thereby, the feed tooth 70 performs four movements of cloth feed in the feed tooth hole 32 of the needle plate 31.

To remove the impurities deposited in the transfer mechanism portion, only the cover 41 shown in FIG. 3 is pulled to the left against the friction of the leaf spring 44 and separated from the needle plate stand 34 as shown in FIG. do.

In addition, in the present invention, the guide pin fixed to the needle plate stand 34 on one side end surface of the sliding portion 62 of the conveying base 61 to be loosely fitted so as to slide in the groove 52 of the conveying table 51. By sliding the cross section of (66), the sliding portion 62 was configured not to move laterally. Thereby, the thickness of the sliding part of the conveying base can be thickened while keeping the distance from the needle hole of the conveying tooth to the distal end face of the needle plate and the needle plate stand short, so that the sliding part is less likely to wear and the durability is improved.

As mentioned above, since the cover which covers these notch parts was attached so that attachment and detachment were possible with respect to the needle plate stand which has notch parts below and below the front end surface, the following effects are acquired.

To remove impurities deposited on the feed tooth or the transport mechanism below, simply remove the cover from the needle plate stand, and after removing the impurities, it is enough to simply insert the cover into the needle plate stand to remove impurities. And, because the work does not adversely affect the sewing machine parts, such as the lower shaft, the operator can safely remove the effect is obtained.

In addition, since impurities do not enter the sliding portion or the connecting portion of the transfer mechanism, a large resistance does not occur, so that the driving of the sewing machine is not disturbed and sewing is difficult, and the efficiency of the sewing operation is improved. In addition, since the wear of the sliding portion and the connecting portion decreases, there is an effect such as excellent durability.

Furthermore, since the present invention does not need to precisely process the cylinder bed, the groove of the transfer table, the sliding portion of the transfer base, etc., there is an effect that the processing cost can be reduced.

Claims (1)

The cylinder bed extends horizontally, A needle plate formed at an upper surface thereof and having a needle plate fixed to the cylinder bed to cover an upper side of the cylinder bed end surface; A needle plate stand formed on a lower surface and a lower end surface thereof and fixed to the cylinder bed to cover the lower end of the cylinder bed front end surface; A cylinder bed of a sewing machine, characterized in that a cover that can be attached to and detached from the needle plate stand to cover the cutout portion of the needle plate stand.

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