JPH0426880B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a button holding device for a button sewing machine, etc., and particularly to a button holding device that holds a button at three points.

[Conventional technology]

Conventionally, as this type of device, there is one shown in FIG. 8, for example.

This device consists of a pair of button knob legs a and b that are rotatable around rotational axes C ₁ and C ₂ , and a holding claw C provided on the symmetric center axis l ₁ of the button knob legs a and b. , the ends of the holding claw C and the gripping feet a and b are brought into contact with the outer peripheral surface of the button B, and 3
The button B is held at the point.

The ends a ₁ and b ₁ of the button grip legs a and b that contact the button B are both inclined inward, thereby pressing the button B toward the holding claw C and firmly holding it. It is designed to be held in place.

[Problem that the invention seeks to solve]

However, in the conventional button holding device described above, the button grip legs a and b are rotated around the rotation axes C ₁ and C ₂
Button B is held by rotating around , so if the size of button B changes, the contact position of button knob feet a and b against button B changes. There were times when the button could not be held properly. In other words, the diameter of button B becomes larger, and the contact positions P ₁ and P ₂ of the button knob feet a and b with respect to button B are perpendicular to the axis l ₁ and are larger than the reference line l ₂ passing through the center of button B. If it leans toward the holding claw side (see Figure 8b),
An outward force was applied to the button B by the two gripping feet a and b, and there was a risk that the button B would pop out.

For this reason, in the past, multiple types of knob feet were prepared to match the diameter of the button and used as appropriate, but this required time and effort to replace, resulting in a decrease in productivity. In addition, in a normal button sewing machine, the needle drop position (position of the buttonhole) is set based on the center of the button, but in the case of the conventional holding device mentioned above, it is set based on the button diameter. Therefore, since the center position changes, there is also the trouble of having to reset the reference every time the center position changes.

The present invention has been made in view of the problems of the conventional devices, and an object of the present invention is to provide a button holding device that can securely hold buttons of any diameter without replacing any of the constituent members.

[Means to solve the problem]

The present invention provides a mounting plate provided with a pair of left and right first guide grooves each extending at a predetermined angle α (α<90°) with respect to a first reference line; a moving plate that is fitted so as to be movable along a second reference line perpendicular to the line, and a holding claw that protrudes along the second reference is provided on the moving plate, and the moving plate is provided with a holding claw that projects along the second reference line, and that A pair of left and right second guide grooves forming an angle of 2 (90°-α) is provided, and a pair of left and right gripping feet positioned between the mounting plate and the moving plate are moved to the first and second guide grooves, respectively. It is possible to fit them together.

[Effect]

In this invention, when the mounting plate is moved along this reference line, the pair of left and right gripping legs are moved in parallel along the first and second guide grooves, respectively.

Since the second guide groove is formed along the bisector of the angle formed by the first guide groove and the second reference line, the amount of movement on the reference line is the same as the amount of movement of the movable plate. Therefore, regardless of the size of the button, the button can be firmly held by bringing the three points, the ends of both clamping legs and the end of the holding part, into contact with the outer periphery of the button. In addition, since both clamping feet and holding claws move on a radial line centered on the center point of the button, there is no need to change the setting standard for the needle drop position of the sewing machine depending on the size of the button, and the setting operation by the operator is simplified. It can be simplified.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 7.
This will be explained based on the diagram.

In the figure, 1 is a mounting plate. This mounting plate 1
Two first guide grooves 1a and 1b are formed on the lower surface, and a long hole 1c is formed in the center.
Both first guide grooves 1a and 1b are each formed with an inclination of a predetermined angle α (for example, 6°) with respect to a first reference line _L1 assumed for the mounting plate 1,
They are symmetrical to each other with respect to the second reference line _L2 . Note that the second reference line _L2 is a line assumed for the mounting plate 1 and is orthogonal to the first reference line _L1 , and the long hole 1c is formed in the mounting plate ₁ along this second reference line L2. has been done. In addition, 1d is a fitting groove formed on the lower surface of the mounting plate 1 along the second reference line _L2 , and 1e is a fixing plate fixed to the rear end of the mounting plate 1 with screws 1f, 1f, not shown. It is designed to be fixed to sewing machines.

Reference numeral 2 denotes a moving plate having a convex portion 2a formed on its upper surface to movably fit into the fitting groove 1d of the mounting plate 1, and a second reference line _L2 at the tip of the convex portion 2a.
A holding claw 2b is formed to protrude along the
A locking portion _2b1 is formed in the holding claw 2b.
Moreover, 2c and 2d are a pair of second guide grooves extending left and right at a predetermined angle β, respectively, with respect to the second reference line _L2 . This second guide groove 2c, 2d
The angle β is in the relationship β=1/2 (90°−α), and here, since α is set to 6°, β is set to 42°.
Further, 2e is a locking screw protruding from the upper surface of the convex portion 2a, and its head 2e ₁ is connected to the elongated hole 2 of the mounting plate 1.
c and 2d, and thereby the mounting plate 1
The fitted state between the movable plate 2 and the movable plate 2 is maintained.

A guide shaft 3 has one end fixed to the rear end of the movable plate 2, and the other end is movably inserted into a support frame 4 fixed to the mounting base 1. Further, reference numeral 5 denotes a push spring inserted through the long screw 3, and its both ends are in pressure contact with the rear end of the movable plate and the support frame 4, respectively, and the movable plate 2 is moved forward along the second reference line _L2 ( Y
direction).

Reference numerals 6 and 7 indicate button holding feet interposed between the mounting plate 1 and the movable plate 2, and rollers 61, 62, 63 and 71, 72, 73 are provided at the rear of each leg (see Fig. 4). , see Figure 5). Two rollers 61 and 62 provided on the top surface of one button clamping foot (hereinafter referred to as the right clamping foot) 6 are movably fitted into the first guide groove 1a of the mounting plate 1.
A roller 63 provided on the lower surface fits into the second guide groove 2c of the movable plate 2. Similarly, regarding the other button holding foot (hereinafter referred to as the left holding foot) 7, the rollers 71 and 72 are placed in the first guide groove 1b.
The rollers 73 are movably fitted into the second guide grooves 2d. Furthermore, button locking step portions 6a and 7a are formed on the inside of the tip portions of both clamping feet 6 and 7, respectively, and are in contact with the lower and peripheral surfaces of the button. Then, the button holding pieces 64, 74 are attached to the screws 64a, 74b.
It is installed at. These two gripping legs 6, 7 are symmetrical about the second reference line _L2 , and the rising surfaces _6a1 , 7a1 of the locking parts 6a, _7a are aligned with the second reference line L2, respectively. ₂ at an angle α (6° in this case).

Reference numeral 8 denotes a stopper which is rotatably mounted on the mounting plate 1 with a screw 81, and has an arc-shaped elongated hole 8a formed at one end thereof, and a fixing screw 82 inserted through this elongated hole 8a allows the stopper to be rotated. It can be fixed at any rotational position within the range of the elongated hole 8a. The moving table 2 is placed on one side of this stopper 8.
The head 2e ₁ of the screw 2e that moves together with the movable table 2 comes into contact with the movable base 2, thereby restricting the forward movement range of the movable table 2.

Based on the above configuration, the operation will be explained next.

When the button B is not held, the moving plate 2
is set at the frontmost position by the pressing force of the pressing spring 5, that is, at a position where the head _2e1 of the screw 2e abuts one side of the stopper 8. Here, hold the outer periphery of the button B at the locking steps 6a, 7 of the gripping legs 6, 7.
When the button A is brought into contact with the button B and pushed backward (in the Y' direction), the gripping legs 6 and 7 are pressed left and right by the outer periphery of the button B and move. At this time, both the gripping legs 6 and 7 are connected to the two rollers 6 provided on the upper surface.
1, 62 and 71, 72 are fitted into the first guide grooves 1a, 1b of the mounting plate 2.
7 moves in parallel along the first guide grooves 1a, 1b. That is, it moves in parallel to the left and right at an angle of 6 degrees with respect to the first reference line _L2 . This parallel movement of the clamping plates 6, 7 moves the fitting position between the rollers 63, 73 provided on the lower surface and the second guide grooves 2c, 2d, and the movable plate 2 is positioned on the second reference line _L2. Fitting groove 1
Move backward (Y direction) along d while compressing the push spring.

Further, as described above, the second guide grooves 2c and 2
d form the same angle β with respect to the second reference line L ₂ , both the gripping legs 6 and 7 move by the same amount at the same time, and the angle β is the same as that of the rollers 63 and 7.
3 (center axis of the second guide grooves 2c, 2d) and the first reference line _L2 (β = 1/2 (90° - α)). ),
The amount of movement of the moving plate 2 is also the same amount as the amount of movement of the clamping feet 6 and 7.

In this way, if the button B is pushed in until it comes into contact with the holding claw 2b while moving the gripping feet 6, 7 and the movable plate 2, the holding claw 2b and the gripping feet 6, 7 will be pressed against the button by the pressing force of the push spring 5. The outer peripheral portion of B is pressed and held from three directions toward the center. In this embodiment, the locking step portions 6a, 7a of both gripping legs 6, 7 are
is formed at an angle of 6° with respect to the second reference line _L2 (hereinafter, this angle is referred to as the insertion angle), the pressing force from both stepped portions 6a and 7a pushes button B to Y. Since the button B is pressed in the direction of ', the button B is pressed against the holding claw 2b, and is firmly held without jumping outward. This is true for buttons of any diameter.
For example, as shown in FIGS. 7a and 7b, when buttons B ₁ and B ₂ with different diameters are held, both gripping legs 6,
7 and b, but these three members 6, 7, 2
Since b is designed to move in parallel by the same amount,
The contact positions for buttons B ₁ and B ₂ are exactly the same and do not change. Therefore, the above-mentioned insertion angle does not change, and the button does not protrude outward.
Moreover, since the center position of button B is always maintained at a fixed position, there is no need to reset the reference needle drop position when driving the sewing machine, and the operator's operations can be simplified.

In addition, in the above embodiment, the plunge angle α
is set to 6°, but other angles, for example 0°, are also possible, and the present invention is not particularly limited to the above embodiment.

〔Effect of the invention〕

As explained above, according to the present invention, there is an effect that buttons of any diameter can be reliably held without replacing any of the constituent members. Furthermore, since the center position of the button is always at a fixed position regardless of the size of the diameter, there is no need to reset the standard for the needle drop position in the sewing machine, and the operator's operations can be simplified.

[Brief explanation of drawings]

Figures 1a, b, and c are a plan view, front view, and side view showing one embodiment of the present invention, Figure 2 is a schematic bottom view of the structure shown in Figure 1a, and Figures 3a, b, and c. is the first
The plan view, front view, and side view of the mounting plate shown in the figure; c is a plan view, front view, and side view of the right hand gripping foot shown in FIG. 1, and FIGS. 6 a, b, and c are a plan view, front view, side view, and 7a and 7b are explanatory bottom views showing a state in which buttons of different diameters are held in the device shown in FIG. 1, and FIGS. 8a and 8b are explanatory plan views showing a conventional button holding device. 1a, 1b...first guide groove, 2...moveable plate,
2b...holding claw, 2c, 2d...second guide groove,
6,7...Holding foot, _L1 ...First reference line, _L2 ...
Second reference line.

Claims (1)

[Scope of Claims] 1. A mounting plate having a pair of first guide grooves each extending obliquely at a predetermined angle α with respect to a predetermined first reference line; The second line perpendicular to the reference line
a movable plate 2 having holding claws fitted together so as to be able to move in parallel along a reference line and disposed on a first reference line; formed symmetrically with respect to the second reference line;
a second guide groove formed in the movable plate so as to form an angle of 1/2 (90°−α) with respect to the second reference line, and a second guide groove interposed between the mounting plate and the movable plate, and a pair of left and right button clamping feet having fitting portions that movably fit into the first and second guide grooves, and each end of the button clamping feet and the holding claw is brought into contact with the outer periphery of the button. A button holding device characterized in that the button is held at three points.