JP3186963U - Sewing machine magnifier - Google Patents

Abstract

[Purpose] A magnifying glass for a sewing machine that can be easily attached to the sewing machine, can be exchanged for lenses with different magnifications, and has a high degree of freedom in adjusting the angle in the horizontal and vertical directions along the operator's line of sight. To provide.
[Structure] In a magnifying glass of a sewing machine for magnifying the tip of a needle mounted on a sewing machine body and moving up and down and the vicinity of a presser foot, a holding means 4 for detachably holding a lens is provided at one end. A support arm portion A provided with a mounting portion 3 for mounting on the sewing machine main body at the other end. A lens body B including a lens portion 5 formed continuously with a connected portion 6 detachable from the lens holding portion 2;
[Selection] Figure 1

Description

  The present invention is a sewing machine magnifying glass that can be easily attached to the sewing machine, can exchange lenses with different magnifications, and has a high degree of freedom in adjusting the angle in the horizontal and vertical directions along the operator's line of sight. About.

  Generally, in a home sewing machine, it is always necessary to pass a thread through a needle hole of a sewing machine needle as a preparation stage of work. Most of the sewing machines that are widely used today are equipped with a needle hole threading device. However, there are sewing machines that are not equipped with such a threading device. In such a sewing machine, it is necessary to manually thread the needle hole.

  Therefore, a magnifying glass (lens) that can be attached to the sewing machine is required to assist the threading operation. In addition, a magnifying glass is also required to visually determine whether a thread is passing through the needle hole of the sewing needle.

  Furthermore, a magnifying glass may be required when exchanging equipment such as a sewing needle or cloth presser or cleaning cloth waste around the needle plate. And the magnifier which can be mounted | worn with such a sewing machine is disclosed by patent document 1, patent document 2, patent document 3, and patent document 4.

JP-A-11-267388 Japanese Patent Laid-Open No. 2002-18168 Japanese Utility Model Publication No. 7-9279 US Pat. No. 3,822,088

  The operator of the sewing machine usually has different vision and field of view. Therefore, in the ones disclosed in Patent Documents 1 to 4, it is possible to slightly change the position or angle of the lens, but this is not satisfactory for the operator. In Patent Document 4, the degree of freedom of lens position and angle adjustment is high, but the structure is complicated and the apparatus is relatively large.

  In particular, in Patent Document 4, since the apparatus is large, there is a possibility that it may become an obstacle to the sewing operation of the original sewing machine. Therefore, an object of the present invention (technical problem to be solved) is a sewing machine that can adjust the horizontal position and vertical position of a lens with a very simple structure and can exchange lenses having different magnifications. May provide a magnifying glass.

  Accordingly, as a result of diligent research, the inventor devised the invention of claim 1 to attach the tip of the needle mounted on the sewing machine body and the tip of the needle attached to the tip of the needle bar that moves up and down and the presser foot. In a magnifying glass of a sewing machine that magnifies the vicinity, a support arm portion provided with a lens holding portion having a holding means for detachably holding a lens at one end and a mounting portion for mounting on the sewing machine body at the other end And a magnifying glass for a sewing machine comprising a lens body comprising a connected portion detachable with respect to the lens holding portion and a lens portion continuously formed on the connected portion. did.

  The invention according to claim 2, wherein the holding means is a holding shaft that reciprocates in the axial direction on one side piece of the holding frame, and a pressure that causes the holding frame to press and move the holding shaft inward of the holding frame. 2. The sewing machine magnifying glass according to claim 1, wherein a portion to be connected is formed by pressing the connected portion of the lens body against the other side piece of the holding frame by the holding shaft. Solved.

  The said subject was solved by making the said press part into the magnifying glass of the sewing machine of Claim 1 which uses the device of Claim 3 as an elastic member. According to a fourth aspect of the present invention, the holding means is provided with a knob portion pivotally connected to the holding shaft and outside the holding frame, and the knob portion rotates around the pivot connection portion. The above problem is solved by using the sewing machine magnifier according to claim 2, wherein the holding shaft is reciprocated within a predetermined range.

  The invention of claim 5 comprises the holding shaft on which an external screw is formed, and the holding frame on which an internal screw that is screwed with the external screw is formed, and the holding shaft is connected to the external screw and the internal screw. The above-described problem has been solved by using the sewing machine magnifying glass according to claim 2 that can be moved forward and backward in the axial direction by screwing.

  The invention according to claim 6, wherein the lens main body portion is provided with a plurality of lens portions having different magnifications, and the desired lens main body is replaceable with respect to the support arm portion. By using the sewing machine magnifying glass according to any one of 1, 2, 3, or 4, the above-mentioned problems have been solved.

  In the invention of claim 1 and claim 2, the holding means of the support arm portion includes a holding shaft that reciprocates in the axial direction on one side piece (first side piece) of the holding frame, and the holding frame includes A pressing portion that presses and moves the holding shaft inward of the holding frame is provided, and the connected portion of the lens body is pressed against the other side piece (second side piece) of the holding frame by the holding shaft. It is set as the structure which carries out.

  With such a configuration, the holding shaft is moved to the side opposite to the pressing direction by the pressing portion, and the interval between the holding shaft tip (pressing tip portion) and the other side piece (second side piece) of the holding frame is slightly widened. Thus, the connected portion of the lens body can be disposed between the distal end of the holding shaft and the other side piece (second side piece) of the holding frame.

  Next, by making the holding shaft free, the holding shaft moves in the pressing direction by the pressing portion, and the connected portion of the lens body is held between the holding shaft and the other side piece (second side piece) of the holding frame. Can be fixed. As a result, the connection and separation between the support arm portion and the lens body can be completed extremely easily and instantaneously.

  Further, the lens body has a connected portion sandwiched by a pressing portion between the holding shaft tip and the other side piece (second side piece) of the holding frame. It will be clamped in a pressed state at all times, an appropriate pressing force will be applied to the connected part, and the lens body can be stopped in that state at any rotation angle on the horizontal axis. .

  Therefore, the angle of the lens unit can be adjusted so that the inclination angle of the lens unit of the lens main body is stopped at a position adapted to the height position of the worker's eyes. In this way, the lens body is configured so that the lens holding portion of the support arm can rotate with respect to the horizontal axis and stop at that position. It is possible to make the needle hole easier to thread by setting the optimum inclination angle for the operator.

Further, the support arm portion and the lens body are detachable, and when sewing work is performed, the working space of a normal sewing machine can be secured by removing the lens body from the support arm portion. Thus, in the invention of claim 1, the support arm portion and the lens main body can be connected and separated very easily, and the lens main body is rotatable with respect to the horizontal axis and has a desired shape. It can be stopped at the position, and the threading state to the needle hole can be enlarged and visually confirmed.

  In the invention of claim 3, the pressing portion is an elastic member. By using the elastic member as a coil spring, the holding shaft is inserted into the coil spring along the axial direction, so that a slight amount is obtained. Even within the space, the holding shaft can be elastically biased from the one side piece (first side piece) to the other side piece (second side piece) of the holding frame. And it can be made small.

  According to a fourth aspect of the present invention, the holding means is provided with a knob portion pivotally connected to the holding shaft and outside the holding frame, and the knob portion rotates around the pivot connection portion. Thus, the holding shaft is configured to reciprocate within a predetermined range.

  With such a configuration, the attachment and detachment between the support arm and the lens body can be made very simply and instantaneously only by rotating the knob portion around the pivot connection point, and the work efficiency of the sewing work can be improved. This can be further improved.

  According to a fifth aspect of the present invention, the holding shaft is formed with an external screw, and the holding frame is formed with an internal screw that is screwed with the external screw, and the holding shaft is formed by the external screw and the internal screw. The holding shaft on which the external screw is formed can be moved forward and backward in the axial direction simply by rotating in the axial circumferential direction by screwing the external screw and the internal screw. The lens main body can be extremely firmly fixed by the front end of the holding shaft and the other side piece (second side piece).

  According to the sixth aspect of the present invention, since the lens main body portion includes a plurality of lens portions having different magnifications, the operator can select a desired lens main body according to the individual's visual acuity. And work efficiency can be improved.

(A) is a perspective view of a state where the magnifying glass according to the first embodiment of the present invention is attached to the sewing machine body, (B) is an enlarged view of (Q1) part of (A), and (C) is an exploded state of the magnifying glass. (D) is a top view of the state which isolate | separated the support arm part and the lens main body. It is an expanded sectional view of the (Q2) part of Drawing 1 (D). (A) is an enlarged view of a main part of the lens holding part of the support arm, and a partly enlarged view of a part of the process of attaching the mounted part of the lens body to the lens holding part of the support arm part. The principal part enlarged view which made the partial cross section of the process which arrange | positioned a to-be-attached part, (C) is the principal part made to the partial cross section of the state which the mounting | wearing of the to-be-mounted part of the lens main body completed to the lens holding part of a support arm part It is an enlarged view. FIG. 4 is a state diagram showing a configuration in which a plurality of lens bodies can be detachably attached to a support body in the present invention. It is the principal part enlarged view which made the support arm part of the magnifying glass in 2nd Embodiment in this invention a partial cross section. (A) is a perspective view in which the magnifying glass of the present invention is to be mounted on a sewing machine face plate, (B) is an enlarged view of (Q3) part of (A), and (C) is a cross-sectional view taken along arrow Y1-Y1 of (B). It is.

  Embodiments of the present invention will be described below with reference to the drawings. There are a plurality of embodiments of the present invention. First, the first embodiment will be described. 1st Embodiment of this invention is comprised from the support arm part A and the lens main body B, as shown in FIG. The support arm portion A includes a lens holding portion 2 and a mounting portion 3 as shown in FIGS. The lens body B includes a lens portion 5 and a connected portion 6 [see FIGS. 1B to 1D].

  The support arm portion A is formed of a thin metal material, and includes a straight arm piece 11 and an inclined arm piece 12 as viewed from above. The inclined arm piece 12 is inclined with respect to the linear arm piece 11 at an appropriate angle on a horizontal plane [see FIG. 1 (D)].

  A lens holding portion 2 is formed on one end side in the longitudinal direction of the inclined arm piece 12 of the support arm portion A, and a mounting portion 3 is formed on the other end side in the longitudinal direction [FIGS. 1 (B) to (D). reference〕. Specifically, the lens holding portion 2 is provided on the inclined arm piece 12 of the support arm portion A, and the mounting portion 3 is provided vertically at the end portion of the linear arm piece 11 [FIG. (See (D), FIG. 6 etc.).

  The lens holding portion 2 is configured such that the connected portion 6 of the lens body B is detachably connected. The lens holding unit 2 has a specific structure in which a holding frame 21 is formed, and the holding frame 21 includes a main frame piece 21a, a first side piece 21b, and a second side piece 21c [FIG. ), See FIG. 2, FIG.

  The main frame piece 21a is a substantially rectangular plate piece, and is formed to be inclined outward and upward from the end of the inclined arm piece 12 of the support arm portion A (see FIG. 1C). . The first side piece 21b and the second side piece 21c are bent at both ends in the longitudinal direction of the main frame piece 21a so as to form a right angle (including a substantially right angle) with the main frame piece 21a. [Refer to FIG. 1 (C), (D), FIG. 2]. A shaft through hole 21d is formed in the first side piece 21b of the holding frame 21, and a circular seat plate 21e is formed on the inner surface side of the second side piece 21c.

  The lens holding unit 2 is provided with holding means 4. The holding means 4 mainly includes a holding shaft 41, a knob 42, and a pressing portion 43 (see FIGS. 1 and 2). The holding shaft 41 is formed with a conical pressing tip 41a at one end in the axial direction, and a pivot pin 41b is inserted at the other end in the axial direction. The knob 42 is connected to the holding shaft 41 through the pivot pin 41b.

  The knob 42 includes a lever portion 42a and two sandwiching pieces 42b and 42b (see FIGS. 1C and 2). The lever part 42a is formed in a substantially triangular shape. The sandwiching piece 42b is formed in a substantially semicircular shape or a substantially “U” shape, and both sides in the width direction are formed on flat surfaces (see FIG. 2).

  Both clamping pieces 42b and 42b are bifurcated portions that face each other in a parallel state (see FIG. 1C). The other end of the holding shaft 41 in the axial direction is disposed between the sandwiching pieces 42b and 42b, and the knob 42 and the holding shaft 41 are pivotally connected by the pivot pin 41b (see FIGS. 2 and 3). . The knob 42 is rotatable with respect to the holding shaft 41 with the pivot pin 41b as a rotation center (see FIGS. 2 and 3).

  The mounting positions of the pivot pins 41b in the respective holding pieces 42b are as follows. When the lever portion 42a and the holding piece 42b are arranged in the vertical direction (see FIG. 2), the vertical direction of the knob 42 is set. It is connected eccentrically on either side with respect to the vertical line (see FIG. 2). The outer peripheral side surfaces of both sandwiching pieces 42b, 42b are formed in an arc shape and abut on the outer surface side of the first outer piece 21b of the holding frame 21 (see FIGS. 2 and 3).

  The pressing portion 43 has a pressing force, and the holding shaft 41 attached to the holding frame 21 by the pressing force is moved inward of the holding frame 21 (a direction from the first side piece 21b toward the second side piece 21c). Press and move. The holding shaft 41 is pressed and moved in the direction from the first side piece 21b of the holding frame 21 toward the second side piece 21c by the pressing force of the pressing portion 43, and the pressing tip 41a and the second side piece of the holding shaft 41 are moved. 21c serves to clamp and press the connected portion 6 of the lens body B to connect and fix the lens body B to the lens holding portion 2.

  There are a plurality of embodiments of the pressing portion 43, and the first embodiment is a pressing portion 43a. The pressing portion 43a is a member having elasticity, such as a spring, and more specifically, a coil spring is used (see FIGS. 1 to 3). The holding shaft 41 penetrates the pressing portion 43a, which is a coil spring, along the axial direction (see FIG. 2).

  The pressing tip 41a of the holding shaft 41 enters the inner side of the holding frame 21 (the inner side surrounded by the main frame piece 21a, the first side piece 21b, and the second side piece 21c), and It is loosely inserted into the shaft through hole 21d of the first side piece 21b, and is elastically biased toward the second side piece 21c of the holding frame 21 by the pressing portion 43a (see FIGS. 1C and 2).

  The knob 42 rotates about 180 degrees around the pivot pin 41b as a rotation center, so that the holding shaft 41 moves in the axial direction so as to enter and exit the shaft through hole 21d (see FIG. 2). . A washer 44 is attached to the holding tip 41 on the side of the pressing tip 41 a, and the washer 44 is fixed by a retaining ring 45.

  And the said press part 43 is arrange | positioned between the 1st side piece 21b of the said holding frame 21, and the said washer 44 [refer FIG.1 (C), FIG.2]. The pressing tip portion 41 a of the holding shaft 41 together with the washer 44 is always elastically biased toward the second side piece 21 c by the pressing portion 43. The knob 42 reciprocates by 180 degrees around the pivot pin 41b, whereby the holding shaft 41 reciprocates in the shaft through hole 21d (see FIG. 2).

  Next, in the second embodiment of the present invention, the structure of the pressing portion 43 is the same as that of the holding frame 21 in which the outer screw 43b is formed and the inner screw 43c in which the outer screw 43b is screwed. The holding shaft 41 is configured to be movable forward and backward in the axial direction by screwing the outer screw 43b and the inner screw 43c. Specifically, as shown in FIG. 5, the inner screw 43 c is formed on the first side piece 21 b of the holding frame 21 and is configured to be screwed with the outer screw 43 b formed on the holding shaft 41. It is.

  With such a configuration, by rotating the large-diameter portion 43 of the holding shaft 41 in the axial circumferential direction, the holding shaft 41 can reciprocate in the axial direction, and the first side piece of the holding frame 21 With reference to 21b, the inside of the holding frame 21 can be configured to be freely advanced and retracted. The connected portion 6 of the lens body B attached to the holding frame 21 is sandwiched and pressed between the pressing tip portion 43a of the holding shaft 41 and the second side piece 21c, and the support arm portion A and the lens body B Can be connected. Further, when the holding shaft 41 is rotated in the axial direction so as to move to the outer side of the first side piece 21b of the holding frame 21, the support arm portion A and the lens body B can be separated.

  In the second embodiment, the washer 44 and the coil spring 43e may be used in combination. Specifically, an external screw 43b is formed in the holding shaft 41 in the axial direction, and a small diameter portion 43d is formed on the pressing tip 43a side in the axial direction. A washer 44 is attached to the small diameter portion 43d so as to be reciprocally movable in the axial direction, and the washer 44 is prevented from being detached from the small diameter portion 43d by a retaining ring 45 fixed to the small diameter portion 43d.

  And the internal screw 43c formed in the 1st side piece 21b of the holding frame 21 is formed in the said shaft through-hole 21d, and the internal screw 43c formation location of the 1st side piece 21b is thicker than another part. It is formed as meat, and the axial dimension of the inner screw 43c is increased. A coil spring 43e is mounted between the washer 44 and the first side piece 21b, and the washer 44 is pressed toward the pressing tip 43a by the coil spring 43e and is in contact with the retaining ring 45. It becomes.

  In the process in which the connected portion 6 of the lens body B is pressed and clamped by the holding shaft 41 and the second side piece 21c, the washer 44 attached to the small diameter portion 43d of the holding shaft 41 replaces the small diameter portion 43d with the first side piece 21b. While moving relatively toward the side, the distance between the washer 44 and the first side piece 21b is narrowed, the coil spring 43e contracts, and the elastic force is increased.

  Thus, a large elastic force is generated between the first side piece 21b and the washer 44 by the coil spring 43e. Therefore, the first side piece 21b and the washer 44 repel each other, and the screwed state between the outer screw 43b of the holding shaft 41 and the inner screw 43c of the first side piece 21b is always firmly tightened. In this state, it becomes difficult for loosening to occur between the outer screw 43b and the inner screw 43c, and as a result, the support arm portion A and the lens body B can be firmly connected.

  The mounting portion 3 has a fitting groove portion 32 formed near the upper end of the columnar shaft portion 31 (see FIGS. 1B and 6). The mounting portion 3 is mounted in a fitted state on a mounted portion C formed on the face plate 81 of the sewing machine body 8 (see FIG. 6). The mounted portion C is composed of holding pieces 82, 82 and a fitting elastic plate piece 83. Specifically, two holding pieces 82, 82 are formed on the inner surface side of the face plate 81. A fitting elastic plate piece 83 is mounted between the holding pieces 82 and 82 (see FIG. 6).

  A fitting bent portion 83a is formed in the fitting elastic plate piece 83, and the supporting arm portion A can be connected to the face plate 81 while fitting with the fitting groove portion 32 of the columnar shaft portion 31 (FIG. 6). (See (C)). As a result, the support arm portion A can rotate on the horizontal plane around the columnar shaft portion 31. An operation piece 13 is formed at an intermediate position of the support arm portion A. The operation piece 13 is formed in a substantially disc shape, and has a shape that can be easily picked up by an operator's finger (see FIG. 1).

  The lens body B is integrally formed of plastic or synthetic resin such as acrylic resin, and includes a lens portion 5 and a connected portion 6 [see FIGS. 1C, 1D, and 4]. ]. The lens unit 5 is formed in a rectangular shape with corners having an arc shape. The connected portion 6 is detachably attached to the lens holding portion 2 of the support arm portion A via the holding means 4.

  The connected portion 6 is continuously formed so as to protrude outward from one end side of the lens portion 5 in the longitudinal direction, and is formed by the cylindrical portion 61 and the insertion groove portion 62 [FIG. (See (D)). The cylindrical portion 61 has an axial hole 61a formed at the center of the diameter. The insertion groove part 62 is formed so as to be orthogonal to the axial direction of the cylindrical part 61 (see FIG. 1D). The insertion groove portion 62 has a groove width into which the second side piece 21c constituting the lens holding portion 2 of the support arm portion A can be inserted (see FIG. 3).

  A pressing tip 41a of the holding shaft 41 of the holding means 4 can be inserted into the opening on the outer side of the shaft core hole 61a, and the holding hole 41a has the holding hole 41a in the holding hole 41a. A circular seat plate 21e formed on the second side piece 21c of the frame 21 is inserted (see FIGS. 1B and 3). Further, ribs 51 are formed in the axial direction of the cylindrical portion 61 and the side of the lens portion 5 near the cylindrical portion 61 (see FIGS. 1 and 4). On the rib 51, the magnification of the lens unit 5 may be written by means such as engraving or printing.

  Next, the process of attaching the lens body B to the lens holding part 2 of the support arm part A will be described with reference to FIG. In the following description, the support body A is the first embodiment. First, the knob 42 in the lens holding part 2 of the support arm part A is rotated, and the holding shaft 41 is pulled out to the outside of the holding frame 21 (see FIG. 3A).

  In this state, the connected portion 6 of the lens body B is disposed between the pressing tip 41a of the holding shaft 41 in the holding frame 21 and the second side piece 21c [see FIG. 3 (B)]. At this time, the axial direction of the cylindrical portion 61 coincides with a line connecting the pressing tip portion 41a of the holding shaft 41 and the second side piece 21c. Moreover, the 2nd side piece 21c will be inserted in the insertion groove part 62 of the cylindrical part 61, and the circular seat board 21e will be in the state inserted in the axial hole 61a.

  When the knob 42 is rotated 180 degrees, the holding shaft 41 moves toward the inner side of the holding frame 21 and toward the second side piece 21c by the elastic force of the pressing portion 43. Thereby, the pressing tip 41a of the holding shaft 41 is inserted into the opening of the axial hole 61a of the cylindrical portion 61, and the gap between the opening of the axial hole 61a on the outer end side of the cylindrical portion 61 and the insertion groove 62 is The holding shaft 41 is sandwiched between the pressing tip 41a and the second side piece 21c with an elastic pressure (see FIG. 3C).

  As described above, the lens main body B is rotatable with respect to the horizontal axis L of the support arm portion A by the lens holding portion 2 and the holding means 4 of the support arm portion A (see FIG. 1B). Further, the cylindrical portion 61 is held between the outer end in the axial direction and the insertion groove portion 62 with an elastic pressure by the elastic biasing force of the pressing portion 43.

  Therefore, even when the lens portion 5 of the lens body B is inclined or horizontal other than when it is in a suspended state, it can remain in that position and maintain a stopped state. That is, the operator can use the lens unit 5 at a desired inclination angle. Specifically, the lens unit 5 can be set to 30 degrees, 45 degrees, 60 degrees, etc. with respect to the horizontal shape.

  When the lens body B is detached from the support arm A and separated, the knob 42 is rotated 180 degrees from the state where the lens body B is mounted, thereby pressing the outer end opening of the cylindrical portion 61 of the lens body B. The holding shaft 41 is pulled out of the holding frame 21. Accordingly, the cylindrical portion 61 of the lens body B can be released from the holding state by the holding means 4 and can be separated from the support arm portion A.

  A restriction pin 71 is formed so as to protrude inward of the main frame piece 21a of the holding frame 21 of the support arm part A, and the restriction pin 71 is inserted at an intermediate position of the cylindrical part 61 of the lens body B. In some cases, a regulating groove 72 is formed. As a result, when the lens body B rotates with respect to the horizontal axis L, the rotation range is restricted by the restriction pin 71 and the restriction groove 72. For example, the lens body B is moved 90 degrees with respect to the horizontal axis L. There may be a structure that can rotate only within the range.

  In the present invention, the support arm part A and the lens body B are provided as a set. Here, a plurality of lens bodies B are provided, and each lens body B includes a lens part 5 having a different magnification. There are several embodiments (see FIG. 4). Specifically, the lens unit 5 having a magnification of 1.2 times, 1.4 times, 1.6 times, or the like is attached to one support arm portion A. Then, the lens body B can be selected according to the visual acuity, visual field, etc. of the operator, and can be detachably attached to the lens holding part 2 of the support arm part A via the holding means 4.

A ... support arm part, B ... lens body, 2 ... lens holding part, 21 ... holding frame, 3 ... mounting part,
32 ... Fitted groove portion, 4 ... holding means, 41 ... holding shaft, 42 ... knob, 43 ... pressing portion,
43a ... elastic member, 43b ... outer screw, 43c ... inner screw, 6 ... connected portion,
62 ... Insertion groove, 8 ... Sewing machine body, 81 ... Face plate, 83 ... Fitting elastic plate piece.

Claims (6)

  In the magnifying mirror of the sewing machine that magnifies the vicinity of the tip of the needle and the vicinity of the presser foot attached to the tip of the needle bar that is attached to the sewing machine body and moves up and down, a lens holding portion having a holding means for detachably holding the lens at one end A support arm portion provided with a mounting portion for mounting on the sewing machine body at the other end, a connected portion detachable from the lens holding portion, and a lens formed continuously to the connected portion. A magnifying glass for a sewing machine, characterized by comprising a lens body made up of a part.   The holding means includes a holding shaft that reciprocally moves in one axial direction on one side piece of the holding frame, and a pressing portion that presses and moves the holding shaft inward of the holding frame. 2. The magnifying glass for a sewing machine according to claim 1, wherein the connected portion of the lens body is pressed against the other side piece of the holding frame by a shaft while being held.   The sewing machine magnifying glass according to claim 2, wherein the pressing portion is an elastic member.   The holding means is provided with a knob portion that is pivotally connected to the holding shaft and the outside of the holding frame, and the knob portion rotates the pivot shaft around the pivot connection portion to move the holding shaft within a predetermined range. 4. The magnifying glass for a sewing machine according to claim 2, wherein the magnifying glass is reciprocated within the sewing machine.   The holding shaft formed with an outer screw and the holding frame formed with an inner screw that is screwed with the outer screw, and the holding shaft is axially moved by screwing the outer screw and the inner screw. The magnifying glass for a sewing machine according to claim 2, wherein the magnifying glass is freely movable. 2. The lens main body part having a plurality of lens parts having different magnifications is provided, and the desired lens main body is replaceable with respect to the support arm part. The magnifying glass of the sewing machine according to any one of 2, 3, 4, and 5.

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