JP2019051098A - Sewing assisting apparatus - Google Patents

Abstract

To enable a sewing machine to stably and beautifully perform automatic sewing using a template.SOLUTION: There is provided a sewing assisting apparatus 1 in which a template P used by being placed on fabric and having a projection P1 extending along a region to be sewn and bending at least at a portion, and which includes a guide part 2 defining a movement direction of the template P by coming into contact with the projection P1 included in the template P when sewing. The guide part 2 has: an outside guide part 21 in contact with an outside face with the bending of the projection P1 in the template P as a reference; and an inside guide part 22 in contact with an inside face P12 with the bending of the projection P1 in the template P as a reference, which is located in the front side of a needle in the sewing machine and is movable in a forward/backward direction.SELECTED DRAWING: Figure 8

Description

  The present invention relates to a sewing auxiliary device that is used in a sewing machine and automatically sews along a template.

  For example, a “cloth guide mechanism in a sewing machine” described in Patent Document 1 exists. This guide mechanism has been used to efficiently sew a fixed area in a fabric product such as a pocket. In this mechanism, a plate-like template (indicated as “cloth support” in Patent Document 1) is used so as to overlap the fabric, so that the operator does not need to put a hand on the fabric and can automatically sew. Has been.

  A guide groove is formed on the surface of the template, and the guide mechanism is provided with a guide pin whose tip is inserted into the guide groove and a guide portion along the edge of the template. The template can be moved according to the shape of the guide groove and the edge of the template by the contact between the guide pin and the guide groove of the template, and the contact between the guide portion and the edge of the template. Then, in the portion where the guide groove and the edge of the template are bent, the direction of the template is changed according to the bending. At that time, the center of the guide pin becomes the center of the rotational motion related to the direction change.

  In the guide mechanism described in Patent Document 1, the needle hole and the guide pin are located on the same line in the front-rear direction. Here, in the needle plate of the sewing machine, a fabric feeding mechanism that performs a fabric feeding (feeding motion) moves up and down with respect to the upper surface of the needle plate. In such a positional relationship, the template moves up and down under the influence of the feed movement of the fabric feed mechanism that accompanies sewing, and this may cause a shift in the left-right direction, which may impair the straightness of the template. For this reason, there was room for improvement in terms of the straight running stability of the template.

Japanese Utility Model Publication No. 5-21873

  Therefore, in order to improve the straight running stability of the template, the inventor of the present application has considered shifting the position for guiding the template, specifically, the position of the guide pin to the position on the near side of the needle hole. If the change is made in this way, the cloth reaches the needle hole after a certain amount of time after being guided, so that the straight running stability of the template is not easily lost.

  However, in the modified configuration, if the bent portion is provided in the template, the guide pin serving as the rotation center reaches the bent portion before reaching the location where the template should be rotated. For this reason, since the template starts the rotational movement earlier than originally intended, there arises a problem that the sewing is not performed well and the stitches are disturbed.

  In view of the above problems, an object of the present invention is to stably and beautifully perform automatic sewing using a template.

  The present invention is a sewing auxiliary device that can be sewn together with a template in a sewing machine, and the template is used by being superimposed on a cloth, and extends along a region to be sewn, and is bent at at least one point. And a guide portion that determines a moving direction of the template by contacting the ridge of the template at the time of sewing, and the guide portion is based on the bend of the ridge in the template. An outer guide portion that contacts the outer surface, and an inner surface that is based on the bend of the protrusion in the template, and is positioned forward of the position of the needle in the sewing machine, and in the front-rear direction. A sewing auxiliary device having an inner guide portion that is movable.

  According to this configuration, since the inner guide portion supports the template in front of the position of the needle, the straight running stability of the sewing is improved, so that the quality of the sewing product can be improved. And if an inner side guide part hits the bending part of a template, since an inner side guide part can shift | deviate back, appropriate sewing according to the bending of a template can be performed.

  The rear end portion of the inner guide portion in the range of movement may be a line that passes through the position where the needle penetrates the cloth and is orthogonal to the moving direction of the template.

  According to this configuration, the inner guide portion does not move any more at the rear end portion. For this reason, the direction of the template can be reliably changed around the inner guide portion by the feed force acting on the template during sewing.

  The inner guide portion can be further moved in the vertical direction.

  According to this configuration, when the template is set at or removed from the sewing location, the inner guide portion can be moved upward, so that work is easy.

  And the said inner side guide part is supported by rotation upwards, and can be rotated in the said front-back direction in the case of sewing.

  According to this configuration, the inner guide portion can be moved in the front-rear direction with a relatively simple structure.

  And when the said inner side guide part follows the said bent part of the said template, it can further be provided with the direction change arm which forcibly changes the direction of the said template.

  According to this configuration, the direction changing arm forcibly changes the direction of the template, so that even if the sewing speed is increased, there is no delay in changing the direction of the template. Can be sewn.

  According to the present invention, it is possible to perform appropriate sewing according to the bending of the template by moving the inner guide portion. Therefore, automatic sewing using a template can be performed stably and beautifully.

It is a perspective view which shows the sewing machine provided with the sewing auxiliary device of this embodiment. It is a perspective view of the front side which shows the principal part of the said sewing assistance apparatus. It is a perspective view of the back side which shows the principal part of the said sewing assistance apparatus. It is a perspective view of the cross section which shows the positional relationship of the structure of the said sewing assistance apparatus. An example of the shape of the template used for the said sewing auxiliary | assistance apparatus is shown with the piled-up cloth, (a) is a top view, (b) is AA arrow sectional drawing of (a). An example of the shape of the template used for the said sewing assistance apparatus is shown with the piled-up cloth, (a) is a top view, (b) is BB arrow sectional drawing of (a), Comprising: The folded template Shows the state where the dough is stacked. It is the schematic of the planar view which shows the relationship between a guide part and a template in the said sewing assistance apparatus. It is the schematic of the planar view which shows the relationship between a guide part and a template in the said sewing assistance apparatus, Comprising: (a) shows the state where the inner side guide part followed the bending part of the rail part in a template, (b) is ( The state which the inner side guide part moved back from the state of a) is shown. It is the schematic explaining that a direction change arm pushes a template in the said sewing assistance apparatus.

  Next, an embodiment of the present invention will be described. Regarding the expression of the front-rear direction, the direction closer to the operator performing sewing (the right side in FIG. 1) is “front”, and the direction farther (the left side in FIG. 1) is “rear”. To do. Further, the expression of the top, bottom, left and right is expressed in the direction when the operator sees the sewing machine M provided with the sewing assist device. Moreover, the expression inside and outside regarding the template P and the guide part is “inside” on the side close to the center in the plan view of the template P (see, for example, FIGS. 5A and 5B and FIGS. 6A and 5B). The side close to the edge is defined as “outside”. In another viewpoint (which may not coincide with the inside and outside in the above viewpoint), when the bending of the protrusion (rail portion) P1 in the template P is used as a reference, the side near the center of curvature of the bending is referred to as “inside ”And the far side as“ outside ”.

  As shown in FIGS. 1 to 3, the sewing assisting device 1 according to the present embodiment is provided in an overlock sewing machine (hereinafter simply referred to as “sewing machine”) M, which is a sewing machine for performing over-stitching, for example. Used. The template P moves rearward by the feed movement of the fabric feed mechanism M3 protruding upward from the needle plate M1. The sewing assisting device 1 can perform sewing without necessarily requiring the operator to put a hand. Of course, it is also possible to sew with hands. The sewing assisting device 1 is separate from the sewing machine M, and is provided across the attachment part A and the sewing machine M (specifically, the presser M2) that are units attached to the sewing machine M by, for example, bolting. ing.

  The template P is used by being superimposed on the fabric C as shown. Examples of the planar shape include those shown in FIG. 5A and FIG. 6A, but are not limited thereto, and various shapes can be used. The template P is configured so as not to be displaced from the fabric C during the sewing operation. For example, as shown in FIGS. 5 (a) and 5 (b), a surface fastener (not shown) is provided on the lower surface and the template P is fixed to the fabric C, or FIGS. 6 (a) and 6 (b). As shown in the figure, it is conceivable that the template P can be opened and closed via a hinge portion P2 to be bent (see the state shown by the two-dot chain line) and the fabric C is sandwiched and fixed to the template P. In addition, Fig.6 (a) has shown the state which extended the template P with the dashed-two dotted line.

  The template P has a rail portion P1 which is a protrusion extending along a region where the fabric C is sewn. As shown in FIGS. 5A, 5B and 6A, 6B, the rail portion P1 is a combination of a straight portion P1a (including a slightly curved portion) and a bent portion P1b. Configured. Note that the magnitude of the curvature of the bent portion P1b can be appropriately set as shown in FIG. In addition, the rail portion P1 may have a shape closed around the outer edge of the template P as shown in FIG. 5A, or the shape of the template P as shown in FIG. It may have an open shape (for example, a substantially C shape) along a part of the outer edge, and can have various shapes corresponding to the sewing form. The rail part P1 protrudes from the upper surface of the main body of the template P. Here, in the template P of Patent Document 1, it is necessary to dig a guide groove in the main body of the template P. In contrast, in the present embodiment, for example, a resin flat plate is used as the main body of the template P, and the rod-shaped rail portion P1 can be attached to the upper surface of the template P with an adhesive or the like.

  Here, in the mechanism using the template described in Patent Document 1 (indicated as “cloth support” in Patent Document 1), the guide groove and the edge of the template are separately guided. On the other hand, in this embodiment, since the guide portion guides both the outer surface and the inner surface of the rail portion P1, it is sufficient in terms of function to form one rail portion P1. For this reason, there exists an advantage which can simplify the structure of the template P. FIG.

  The sewing assisting device 1 of the present embodiment includes a guide portion 2 that determines the moving direction of the template P by contacting the outer side surface P11 and the inner side surface P12 of the rail portion P1 of the template P during sewing. The guide portion 2 includes an outer guide portion 21 and an inner guide portion 22.

  The outer guide portion 21 is provided in the sewing machine M, and is provided on a presser M2 used to press the fabric C above the needle plate M1. Specifically, the left end edge portion of the presser M2 is an outer guide portion 21. As shown in FIG. 7, the outer guide portion 21 makes at least line contact with the outer surface P11 of the rail portion P1 (actually, the outer guide portion 21 is also in surface contact because it also contacts in the vertical direction). The said line contact is made over the front-back direction. Thus, the template P can be stably moved rearward as the fabric C is fed during sewing. Note that the contact mode of the outer guide portion 21 with respect to the rail portion P1 is not limited to line contact, and if it is configured to make point contact with the outer surface P11 of the rail portion P1 at two or more points separated in the front and rear directions, Since the rail portion P1 can be positioned, the template P can be stably moved in the same manner as the line contact.

  The inner side guide part 22 is provided in the movable part 3 provided so that rotation with respect to the main body of the attachment part A was possible. The inner guide portion 22 is a substantially cylindrical portion formed so as to protrude downward, and is at least point-contacted with the inner side surface P12 of the rail portion P1 (actually, a line for contacting also in the vertical direction). Contact). In addition, the front-end | tip part 221 of the inner side guide part 22 is formed in the level | step difference 222 because it was made smaller diameter than the other part of the base end side. The step 222 is positioned so as to overlap the rail portion P1 when the tip 221 of the inner guide portion 22 is in contact with the inner side surface P12 of the rail portion P1. It is desirable that the tip portion 221 has a small diameter because an area where the outer peripheral surface of the tip portion 221 contacts the inner surface P12 of the rail portion P1 can be reduced, and ideal point contact (line contact) can be realized. On the other hand, in order to maintain the overall strength of the inner guide portion 22, it is desirable that portions other than the tip portion 221 be formed with a large diameter. For these reasons, the step 222 is formed. However, in the present embodiment, the step 222 is not an essential element, and the step 222 may not be formed.

  The inner guide portion 22 is positioned forward of the position of the needle on the sewing machine M (specifically, as shown in FIG. 7, the left and right lines L passing through the position X where the needle of the sewing machine M penetrates the cloth in plan view). To do. And this inner side guide part 22 can be moved to the front-back direction. The inner side guide part 22 of this embodiment is rotatably supported by the rotation support part 31 provided in the movable part 3, as shown in FIGS. The rotation center of the rotation support part 31 extends in the left-right direction and in the horizontal direction. With this rotation support portion 31 as the center, it is configured to rotate (move in the direction of the curved arrow shown in FIG. 3) in a predetermined range in the front-rear direction during sewing. Further, the inner guide portion 22 is always urged forward by a front spring 32. For this reason, the inner side guide part 22 is located in the front-end part in the movement range of the front-back direction in the state which does not receive external force from the template P. FIG. This position is a normal position (position shown in FIGS. 1 to 4).

  Since the inner guide portion 22 supports the template P in front of the position of the needle, the position where the template P is guided and the position of the needle can be separated from each other in the front-rear direction. As a result, the template P moves up and down under the influence of the feed movement of the fabric feed mechanism M3 that moves up and down with reference to the upper surface of the needle plate M1 as a reference, which has been a problem in the past, and this shifts in the left and right direction. As a result, it becomes difficult to occur, and the straight running stability of sewing is improved, so that the quality of the sewing product can be improved. And when the inner side guide part 22 hits the bending part P1b of the rail part P1 in the template P, the inner side guide part 22 can shift | deviate back. When the inner guide portion 22 is displaced rearward and reaches the position of the needle, the direction of the template P is changed. For this reason, appropriate sewing according to the bending of the rail part P1 in the template P can be performed. In addition, by making the inner guide portion 22 move back and forth by rotation, a relatively simple structure can be achieved.

  The rear end portion of the inner guide portion 22 in the moving range in the front-rear direction passes through the position where the needle penetrates the cloth C (the position of the needle hole), and the moving direction of the template P (in FIG. It corresponds to a line L (that is, a line extending in the left-right direction) L orthogonal to the straight line portion P1a). The term “coincidence” does not indicate only a state in which the front / rear difference is completely matched in the front-rear direction, but the central axis of the inner guide portion 22 having a substantially cylindrical shape (in this embodiment) is the template. If the position acts as the rotation center of P, a state where the line L is slightly shifted in the front-rear direction is also included.

  When the inner guide portion 22 is along the inner surface P12 located at the straight line portion P1a in the rail portion P1, the inner guide portion 22 is at the front end portion of the moving range under the bias of the front spring 32 as shown in FIG. . The template P moves backward by the feed force acting on the template P from the fabric feed mechanism M3 that moves up and down with reference to the upper surface of the needle plate M1 of the sewing machine M during sewing. At this time, the template P is guided by the outer guide portion 21 and the inner guide portion 22 and moves rearward in the linear direction. Thereafter, as shown in FIG. 8A, when the inner guide portion 22 comes along the bent portion P1b of the rail portion P1, the template P tends to continue to move backward in the linear direction as described above. For this reason, as shown with an arrow in FIG. 8B, the inner guide portion 22 moves backward by being pushed by the inner side surface P12 located at the bent portion P1b of the rail portion P1. Thereafter, the inner guide portion 22 does not move any more at the rear end of the movement range. As a result, the template P receiving the rearward feeding force starts to rotate around the center of the cross section of the inner guide portion 22 (rotation in the lower arrow direction shown in FIG. 9). This rotational motion continues until the inner guide portion 22 comes along the linear portion P1a of the rail portion P1. After that, the template P again moves backward in the linear direction. Thus, according to the configuration of the present embodiment, the direction of the template P can be reliably changed around the inner guide portion 22 by the feed force acting on the template P during sewing.

  The inner guide portion 22 is also movable in the vertical direction (moving in the direction of the straight arrow shown in FIG. 3). Since the inner guide portion 22 is urged downward by the upper and lower springs 33, the inner guide portion 22 is normally positioned downward. When the template P is set at or removed from the sewing location, the upper air cylinder 51 can be driven and the inner guide portion 22 can be lifted and moved upward via the link portion 52. For this reason, the work by the worker is easy.

  The sewing assisting device 1 of the present embodiment further includes a direction changing arm 4 that forcibly changes the direction of the template P when the inner guide portion 22 passes along the bent portion of the template P. The direction changing arm 4 is provided so as to be rotatable about the vertical axis. The direction changing arm 4 is rotated by driving the lower air cylinder 53. Further, the return from the rotating state is also performed by driving the lower air cylinder 53 which is a double acting cylinder, but in this embodiment, the rotating range of the direction changing arm 4 is set wider than 90 °. The tensile force of the return spring 54 is used as the initial return force. The turning of the direction changing arm 4 is interlocked with the switch 55 provided at the rear of the inner guide portion 22 being turned on so as to be operated by the rearward movement of the inner guide portion 22. The direction changing arm 4 is in a position (a position shown in FIGS. 3 and 4) that does not interfere with the template P when it does not rotate. When the inner guide portion 22 comes along the bent portion P1b of the rail portion P1, the switch 55 is operated, and the direction changing arm 4 receiving the driving force of the lower air cylinder 53 is rotated counterclockwise in plan view (see FIG. 4). The rotation starts in the direction of the arrow shown). Then, as shown by the arrow in FIG. 9, the tip 41 of the direction changing arm 4 pushes the edge of the template P counterclockwise. As a result, the rotational movement of the template P by the feed force acting on the template P from the fabric feed mechanism M3 is assisted by the turning force of the direction changing arm 4.

  In this way, the direction changing arm 4 can forcibly change the direction of the template P. Thereby, even when the sewing speed is increased, it is possible to prevent a delay in the rotational movement of the template P. Therefore, reliable sewing according to the bending can be performed.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment, A various change can be added in the range which does not deviate from the summary of this invention.

  For example, in the embodiment, the outer guide portion 21 is provided on the presser M2 in the sewing machine M, but it can be provided on the attachment portion A.

  Moreover, in the said embodiment, although the inner side guide part 22 was comprised so that it might rotate in the front-back direction, it can also be comprised so that the whole inner side guide part 22 may move so that it may slide in the front-back direction.

  Moreover, in the said embodiment, although the direction change arm 4 was comprised so that the edge of the template P might be pushed, it can also be comprised so that it may change direction by pulling a part of template P. FIG. Further, the direction changing arm 4 can be configured to move in a linear direction, for example, instead of turning.

DESCRIPTION OF SYMBOLS 1 Sewing auxiliary device 2 Guide part 21 Outer guide part 22 Inner guide part 4 Direction change arm C Fabric L Line M Sewing machine P Template P1 Projection, rail part P11 Outer side P12 Inner side

Claims (5)

It is a sewing auxiliary device that can be sewn with a template in a sewing machine,
The template is used to overlap the fabric, and has a protrusion that extends along a region where sewing is performed and is bent at at least one place.
A guide portion that determines the moving direction of the template by contacting the ridge of the template at the time of sewing,
The guide part is an outer guide part in contact with an outer surface based on the bend of the ridge in the template;
An inner guide portion that is in contact with an inner surface of the template based on the bend of the ridge, located forward of the position of the needle in the sewing machine, and movable in the front-rear direction; A sewing assisting device.   2. The rear end portion of the inner guide portion in the range of movement passes through a position where the needle penetrates the cloth and coincides with a line orthogonal to the moving direction of the template. Sewing assist device.   The sewing assisting device according to claim 1 or 2, wherein the inner guide portion is further movable in the vertical direction.   The sewing assisting device according to any one of claims 1 to 3, wherein the inner guide portion is pivotally supported upward, and pivots in the front-rear direction during sewing.   The sewing assisting device according to any one of claims 1 to 4, further comprising a direction changing arm that forcibly changes the direction of the template when the inner guide portion is along the bent portion of the template.