CN106917195B

CN106917195B - Pushing and lifting device of sewing machine

Info

Publication number: CN106917195B
Application number: CN201611131208.2A
Authority: CN
Inventors: 二宫正司; 三藤智郎
Original assignee: Janome Sewing Machine Co Ltd
Current assignee: Snake Eye Co ltd
Priority date: 2015-12-11
Filing date: 2016-12-09
Publication date: 2021-05-11
Anticipated expiration: 2036-12-09
Also published as: JP3202819U; CN106917195A

Abstract

The invention provides a push-up device of a sewing machine, comprising: a push-up pedestal (A) assembled and fixed on the sewing machine main body (9); a push column (4) which is arranged on the push lifting pedestal (A) in a vertically sliding manner, and a pushing piece of cloth is arranged at the lower end of the push column; an elastic member (6) which is attached to the pressing column (4) and always applies a downward force; a push-up lever B for moving the push-up column (4) upward against the elastic member (6); two bearing portions (2, 3) are formed on the lifting base (A) and pivotally support the lifting rod (B) in a freely rotatable manner. A guide part (31) for aligning the posture of the push-up rod (B) when the push-up rod is assembled is provided on one of the bearing parts (2, 3).

Description

Pushing and lifting device of sewing machine

Technical Field

The present invention relates to a push-up device for a sewing machine excellent in durability and assemblability.

Background

In a general home-use sewing machine, a pusher is attached to a pusher column, and the pusher column and the pusher are moved up and down together by a push-up lever to prepare for sewing. In the structure of the lift device, a member for moving the pusher up and down is attached to a base which is bent by pressing or the like of a metal material having a large plate thickness, and the base is attached to a predetermined position in the sewing machine body.

As a document that discloses such a general structure, there is patent document 1. In patent document 1, a push-up lever is attached to a sewing machine frame constituting a sewing machine main body via a pin shaft. Here, the pin for fitting the lifter to the frame of the sewing machine is usually fixed horizontally at one end. The lift rod is rotatably attached to the pin shaft via a retaining ring such as an E-ring or a stepped screw (the section ね is located at the side of the lift rod).

Patent document 1: japanese patent laid-open publication No. 2011-2454110.

As described above, the pin shaft for mounting the lifter has a structure in which one end is fixed to the frame of the sewing machine, and is a so-called cantilever structure. The pressing column to which the pressing tool is attached is always elastically biased in the axial downward direction by an elastic member such as a coil spring.

The push-up rod is a member that is operated to move in the vertical direction against the elastic biasing force of the elastic member, like the push column in which the pusher is attached to the lower end in this manner. The elastic member elastically urging the pushing cylinder generally has a very strong elastic force. Therefore, the lift lever is always urged by the elastic member with a strong force and is operated against the elastic urging force of the elastic member, and therefore a large work load acts on the pin shaft that pivotally supports the lift lever together with the bending moment.

Therefore, the following malfunctions occur: when the push-up lever is operated, the pin shaft is not fixed to the frame of the sewing machine, the push-up lever is tilted from an appropriate position in an assembled state, and the presser is not raised to a predetermined height.

Disclosure of Invention

Therefore, an object (technical object or object) to be solved by the present invention is to improve durability at the time of swing operation of a lift lever and to make assembly very easy in manufacturing.

Therefore, the inventors have made extensive studies to solve the above problems, and as a result, the first technical means is the following push-up device for a sewing machine, thereby solving the above problems: the disclosed device is provided with: the pushing and lifting pedestal is assembled and fixed on the sewing machine main body; the pushing column is arranged on the pushing platform base in a vertically sliding manner, and a pushing piece of cloth is arranged at the lower end of the pushing column; an elastic member attached to the pressing column and constantly applying a downward force; a push-up lever for moving the push column upward against the elastic member; two bearing portions formed on the lift base and pivotally supporting the lift rod in a rotatable manner; one of the bearing portions is provided with a guide portion for aligning the posture of the lift lever when the lift lever is assembled.

The second technical means solves the above problems by providing a lift device for a sewing machine comprising: the disclosed device is provided with: the pushing and lifting pedestal is assembled and fixed on the sewing machine main body; a push-up column which is arranged on the push-up pedestal in a manner of sliding up and down, and a push-up piece is arranged at the lower end of the push-up column; an elastic member attached to the pressing column and constantly applying a downward force; a push-up lever for moving the push column upward against the elastic member; a bearing portion formed on the lift base and pivotally supporting the lift rod in a rotatable manner; the method comprises the following steps: a swing shaft portion formed on both side surfaces of a body portion of the push-up lever as a rotation axis, a pivot support hole formed in the bearing portion supporting the swing shaft portion, an insertion groove communicating with the pivot support hole of one of the bearing portions and opening to an upper surface of the bearing portion, and a guide portion formed continuously with the insertion groove of the other of the bearing portions for aligning an insertion phase of the push-up lever, wherein the swing shaft portion of the push-up lever is aligned with the insertion phase by the guide portion and is fitted to the pivot support hole via the insertion groove of the bearing portion, thereby rotatably holding the push-up lever.

A third aspect is the following sewing machine lifting device according to the first or second aspect, wherein the aforementioned object is solved by: the guide portion is formed with a guide groove formed continuously with the insertion groove of the bearing portion and a guide hole continuous with the guide groove.

In the first and second aspects, the two bearing portions are formed on the lift base and pivotally support the lift lever so as to be rotatable, and the guide portion for matching the posture of the lift lever at the time of assembling is provided on one of the bearing portions, so that the lift lever can be very easily assembled to the lift base. Further, after the assembly of the lift lever is completed, components such as a stopper are not required, and the number of components can be reduced.

In addition, although the elastic member attached to the lift base is elastically biased during the swinging operation of the lift lever, the two swing shaft portions of the lift lever can uniformly support the elastic biasing force of the elastic member by the two bearing portions, and thus the member can have excellent durability.

Further, since the lift lever is configured such that the swing shaft portions provided on both sides of the main body are supported by two bearing portions formed on the lift base, the lift lever has a structure of a support beam at both ends, and the lift lever is reliably held on the lift base, thereby improving operability and durability.

In claim 3, since the guide portion is formed with the guide groove formed continuously with the insertion groove of the bearing portion and the guide hole formed continuously with the guide groove, the fitting structure formed by the push-up lever and the bearing portion can be made the simplest structure, and the burden on the assembling worker can be reduced.

Drawings

Fig. 1A is a schematic perspective view showing a state in which the present invention is mounted on a sewing machine, fig. 1B is an enlarged view of a portion (α) of fig. 1A, fig. 1C is an enlarged perspective view of a state in which only a lift base and a lift lever are taken out from fig. 1B, and fig. 1D is a cross-sectional view in an arrow direction of Y1-Y1 of fig. 1C.

Fig. 2A is an enlarged perspective view of the lift pedestal, fig. 2B is a partial sectional view of a part of fig. 2A cut-away in the arrow direction of Y2-Y2, fig. 2C is a view in the arrow direction of Y3 of fig. 2B, fig. 2D is an enlarged perspective view of the lift lever, and fig. 2E is a view in the arrow direction of Y4 of fig. 2D.

Fig. 3A is a diagram showing essential parts in a state in which one swing shaft portion of the lift lever is to be fitted to one side bearing portion, fig. 3B is a diagram showing essential parts in a state in which the other swing shaft portion of the lift lever is to be fitted to the other side bearing portion, fig. 3C is a diagram showing essential parts in a process of inserting one swing shaft portion of the lift lever into one side bearing portion in three stages, and fig. 3D is a diagram showing essential parts in a process of inserting the other swing shaft portion of the lift lever into the other side bearing portion in three stages.

Detailed Description

Embodiments of the present invention are described below with reference to the drawings. The present invention mainly includes a push-up base a, a push-up column 4, an elastic member 6, and a push-up rod B (see fig. 1A to 1C). The pushing and lifting base a is a frame-like member for unitizing the pushing and lifting mechanism of the pusher. The lift table a is fixed to the sewing machine main body 9 (see fig. 1A).

The lift base a has a substantially frame shape and mainly includes a top portion 11, a bottom portion 12, and a side wall portion 13.

Slide support holes

11a and 12a are formed in the top portion 11 and the bottom portion 12 of the lift pedestal a, and the push column 4 is inserted through both the

slide support holes

11a and 12a so as to be movable up and down.

An operation member 5 (see fig. 1A and 1B) is fixed to the pressing column 4. The operation member 5 is a member that abuts against the cam surface of the lift lever B and moves in the vertical direction by the rotational operation of the lift lever B, and the operation member 5 is fixed to an axially intermediate position of the push rod by a fixing member such as a stopper. An elastic member 6 is mounted between the top 11 of the push-up base a and the operation member 5 fixed to the push-up column 4. The elastic member 6 is specifically a coil spring.

The compression coil spring as the elastic member 6 always elastically biases the operation member 5, and elastically biases the pressing column 4 downward. The lower end of the pushing column 4 protrudes downward from the bottom 12 of the pushing/lifting pedestal a, and a pusher is detachably attached to the lower end thereof.

The bearing 2 pivotally supports a swing shaft 81 of the push-up lever B, and the bearing 3 pivotally supports a swing shaft 82 (see fig. 1C and 1D). Thus, the lifting rod B is of a double-end support beam type (see fig. 1C), and the lifting rod B is attached to the lifting base a in a stable state. Further, even when the push-up rod B is operated by being swung to move the push-up column 4 in the vertical direction, the operation can be performed in a stable state.

The bearing portion 2 has a substantially upright plate-like bearing frame 21 formed on the bottom portion 12, a pivot support hole 22 and an insertion groove 23 formed in the bearing frame 21, and the insertion groove 23 and the pivot support hole 22 are continuously formed so as to communicate with each other. The insertion groove 23 is located above the pivot support hole 22 and communicates with the outside of the bearing frame 21 (see fig. 1C and 2A).

The other bearing portion 3 is formed in a part of the side wall portion 13 constituting the lift base a (see fig. 2A to 2C). The bearing portion 3 includes a guide portion 31, a pivot support hole 32, and an insertion groove 33, which are continuous and communicate in the up-down direction. The pivot support hole 32 of the bearing portion 3 has the same shape as the pivot support hole 22 of the bearing portion 2 and is disposed coaxially therewith.

An insertion groove 33 is formed above the pivot support hole 32, and a guide portion 31 is formed at the upper end of the insertion groove 33. The guide portion 31 is composed of a guide groove 311 and a guide hole 312 (see fig. 2B and 2C). The guide groove 311 and the insertion groove 33 are integrated as one groove continuous in the vertical direction.

The groove widths of the insertion groove 23 of the bearing portion 2, the guide groove 311 of the bearing portion 3, and the insertion groove 33 are all the same groove width dimension W. The pivot support hole 22, the pivot support hole 32, and the guide hole 312 have the same inner diameter, which is the inner diameter Da. The groove width dimension W is smaller than the inner diameter Da.

The inner diameter Da is formed slightly larger than the diameter Db of each of the swing shaft 81 and the swing shaft 82 of the push-up lever B. Specifically, the diameters Db of the

swing shaft portions

81 and 82 are such that the inner circles thereof are freely rotatable in the pivot support holes 22 and 32.

The width W of the insertion groove 23, the insertion groove 33, and the guide groove 311 is slightly larger than the minimum dimension S of the swing shaft 81 and the swing shaft 82 and smaller than the diameter Db. That is, when the radial direction of the minimum dimension S of the swing shaft portion 81 and the swing shaft portion 82 does not coincide with the groove width direction of the insertion groove 23, the insertion groove 33, and the guide groove 311, the swing shaft portion 81 cannot be inserted into the insertion groove 23, and the swing shaft portion 81 can be inserted into the insertion groove 23 only when the two coincide with each other.

The dimensional relationships among the groove width dimension W of the insertion groove 23, the guide groove 311, and the insertion groove 33, the diameters Db and the minimum dimension S of the swing shaft 81 and the swing shaft 82, and the diameters Da of the pivot support hole 22, the pivot support hole 33, and the guide hole 312 are as follows: s < W < Db < Da.

The lift lever B includes a lever body 7, a swing shaft 81, and a swing shaft 82 (see fig. 2D to 2E). The lever main body portion 7 includes an operation cam portion 71 and a lever portion 72. The operation cam portion 71 has a high position surface 71b that holds the push rod 4 at the high position and a low position surface 71a that maintains the push rod 4 at the low position. High position surface 71b and low position surface 71a are in a positional relationship in which they are adjacent to each other at a predetermined angle.

The lever portion 72 is a portion formed continuously from the operation cam portion 71. The angle formed by the high position surface 71b and the low position surface 71a is an operation angle of the lever portion 72 (see fig. 2D and 2E).

The swing shaft 81 is pivotally supported by the bearing 2 provided on the lift base a, and the swing shaft 82 is pivotally supported by the bearing 3 (see fig. 1C and 1D). The operation cam portion 71 of the push-up lever B attached to the push-up base a is attached in a state of abutting on the operation member 5, and the operation member 5 is fixed to the push-up column 4 (see fig. 1B).

The push-up lever B swings the swing shaft portion 8 about the

swing shaft portions

81 and 82 as a swing center, thereby moving the operation member 5 abutting on the operation cam portion 71 of the push-up lever B in the vertical direction, and moving the push rod 4 fixed to the operation member 5 in the vertical direction (see fig. 1B).

Flat portions

83 and 83 are formed on the swing shaft portion 81 and the swing shaft portion 82, respectively, at a part of the outer periphery of the shafts (see fig. 2D, 2E, and 3). The

flat portions

83 and 83 form a cross section of the swing shaft 81 and the swing shaft 82 perpendicular to the axial direction into a substantially D-shape (see fig. 2D). The flat portion 83 of the swing shaft 81 and the flat portion 83 of the swing shaft 82 are present at the same position in the axial direction.

In the swing shaft 81 and the swing shaft 82, the radial dimension orthogonal to the flat portion 83 is the minimum dimension portion, and this portion becomes the minimum dimension S described above. Further, a radial portion not including the flat portion 83 has a diameter Db (see fig. 2E). The phase at which the lift lever B is inserted into the guide groove 311 is referred to as an insertion phase. The state in which the minimum dimension S of the swing shaft portion 82 is set to the horizontal radial direction and the guide groove 311 can be inserted is referred to as the state in which the insertion phase of the lift lever B is aligned with the guide groove 311.

Next, a process of assembling the lifting rod B to the lifting base a will be described with reference to fig. 3. Fig. 3A is a diagram showing a main portion of the thrust rod B in a state where one swing shaft 81 is inserted into one bearing 2. Fig. 3B is a diagram showing a main portion of the push-up lever B in a state where the other swing shaft 82 is inserted into the other bearing 3.

Fig. 3C is a diagram showing a process of inserting one swing shaft 81 of the push-up lever B into one bearing 2 in three stages. Fig. 3D is a diagram showing a process of inserting the other swing shaft portion 82 of the push-up lever B into the other bearing portion 3 in three stages.

First, the swing shaft 82 of the push-up lever B is inserted into the guide hole 312 of the guide portion 31 of the bearing portion 3 (see fig. 3B). Since the guide portion 31 of the bearing portion 3 is located at a position higher than the upper end of the insertion groove 23 of the bearing portion 2, the swing shaft portion 82 of the push-up lever B can be easily inserted into the guide hole 312 without interfering with other portions.

Next, the flat portion 83 of the swing shaft portion 82 of the push-up lever B is rotated so as to be perpendicular to the insertion phase, and the insertion is enabled by aligning the radial direction of the minimum dimension S of the swing shaft portion 82 with the groove width direction of the guide groove 311 of the guide portion 31 (see fig. 3D). The swing shaft portion 82 is movable in the guide groove 311, and presses down the lift lever B along the guide groove 311.

When the push-up lever B is pushed down in this state, the swing shaft portion 82 reaches the insertion groove 33 from the guide groove 311, and the swing shaft portion 81 reaches the insertion groove 23 of the bearing portion 2. The swing shaft 81 moves downward in the insertion groove 23 and reaches the pivot support hole 22, and the swing shaft 82 moves downward in the insertion groove 33 and reaches the pivot support hole 32.

As described above, the swing shaft portion 82 is set so that the radial direction of the minimum dimension S is aligned with the groove width direction of the guide groove 311 of the guide portion 31 and can be inserted, and the swing shaft portion 81 is also set so that the radial direction of the minimum dimension S can be inserted into the insertion groove 23 of the bearing portion 2. Therefore, only by moving the push-up lever B downward in this state, the swing shaft 81 can reach the pivot support hole 22, and the swing shaft 82 can reach the pivot support hole 32.

Next, when the lever portion 72 of the push-up lever B is swung in a state where the swing shaft portion 81 and the swing shaft portion 82 are pivotally supported by the pivot support hole 22 and the pivot support hole 32, respectively, the swing shaft portion 81 and the swing shaft portion 82 do not return in the opposite directions toward the insertion groove 23 and the insertion groove 33 because the diameter Db of the swing shaft portion 81 and the swing shaft portion 82 is larger than the groove width W of the insertion groove 23 and the insertion groove 33.

Further, the lifter B is set such that the operation range of the lever portion 72 for moving the operation member 5 attached to the push column 4 up and down is different from the insertion phase, and therefore, when the lever portion 72 is operated, the swing shaft portion 81 and the swing shaft portion 82 do not come out of the pivot support hole 22 and the pivot support hole 32, and the lifter B can perform a stable swing operation.

Description of the reference numerals

A, pushing and lifting a pedestal; 2, a bearing part; 21 a bearing frame; 22 pivot bearing holes; 23 inserting the groove; 3, a bearing part; 31 a guide part; 311 a guide groove; 312 guide holes; 32 pivot support holes; 33 inserting the groove; 4, pushing the column; 6 an elastic member; b, pushing a lifting rod; 7 a rod main body portion; 81 a swing shaft portion; 82 swing shaft portions; 83 flat portion; 9 a sewing machine body.

Claims

1. A push-up device of a sewing machine is characterized by comprising: the pushing and lifting pedestal is assembled and fixed on the sewing machine main body; the pushing and pressing column is arranged on the pushing and lifting pedestal in a vertically sliding manner, and a pushing and pressing piece for cloth is assembled at the lower end of the pushing and pressing column; an elastic member attached to the pressing column and constantly applying a downward force; a push-up lever for moving the push column upward against the elastic member; two bearing portions formed on the lift base and pivotally supporting the lift rod in a rotatable manner,

one side of the bearing part is provided with a guiding part for matching the posture of the lifting rod during assembling,

the guide portion is formed with a guide groove formed continuously with the insertion groove of the bearing portion and a guide hole continuous with the guide groove.

2. A push-up device of a sewing machine is characterized by comprising: the pushing and lifting pedestal is assembled and fixed on the sewing machine main body; a push column which is arranged on the push lifting pedestal in a vertically sliding manner, and a push piece is arranged at the lower end of the push column; an elastic member attached to the pressing column and constantly applying a downward force; a push-up lever for moving the push column upward against the elastic member; a bearing portion formed on the lift base and pivotally supporting the lift rod in a rotatable manner,

the method comprises the following steps: a swing shaft portion formed as a rotation shaft on both side surfaces of a body portion of the lift lever, a pivot support hole formed in the bearing portion for supporting the swing shaft portion, an insertion groove communicating with the pivot support hole of one of the bearing portions and opening to an upper surface of the bearing portion, and a guide portion formed continuously with the insertion groove of the other bearing portion for aligning an insertion phase of the lift lever,

the swing shaft of the push-up lever is fitted to the pivot support hole through the insertion groove of the bearing portion by aligning the insertion phase with the guide portion, and rotatably holds the push-up lever.

3. The lift device of a sewing machine according to claim 2, wherein the guide portion is formed with a guide groove formed continuously with the insertion groove of the bearing portion and a guide hole continuous with the guide groove.