JPS6241734Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention is intended for supplying flat processed materials (workpieces) made of various fabrics and similar materials to the target processing equipment. The present invention relates to an apparatus for accurately and smoothly performing correct feeding posture, that is, positioning.

(Prior art) Workpieces made of relatively flexible materials such as various types of knitted, woven, non-woven fabrics, tapes, handkerchiefs, sheets, etc. are cut and formed using sewing machines. Correct positioning of the workpiece is extremely important when feeding the workpiece and performing the required sewing, etc., and the positioning means is to attach one side of the workpiece to a guide member such as a guide plate placed along the positioning reference line. and optical detection members such as phototubes and linear sensors are arranged in two rows inside and outside along the positioning reference line,
There are two types of methods: positioning methods that perform positioning by guiding the workpiece so that one side of the workpiece is always positioned between the sensing members.

(Problems to be Solved by the Invention) Among the above-mentioned conventional techniques, the one in which the guide member is attached to a guide member such as a guide plate is suitable for relatively simple linear positioning, but it is suitable for relatively simple linear positioning. It is difficult to be suitable for directional positioning, and has little utility value in that the range of application is limited.Also, those that use optical detection members can be applied to both straight and curved lines, but they do not deviate inside or outside the positioning reference line. When correcting the misalignment of the workpiece,
It is necessary to correct the positional deviation using some kind of mechanical means, and this means that the moving workpiece must be moved in and out in a direction other than the direction of movement to make it follow the positioning line. In the case of a workpiece, mechanical operations for moving the workpiece are difficult, and troubles such as the workpiece getting stuck or stagnation are likely to occur, and delicate corrections are difficult.

(Means for Solving the Problem) In order to solve the technical problem in positioning such flat workpieces, the present invention provides a detection member that detects the positional deviation of the workpiece with respect to the positioning reference line, and By using a rotary disk body and a workpiece holding member, smooth and accurate automatic positioning of the workpiece can be easily obtained. Therefore, the technical means of the present invention is to transport the workpiece in one direction. a conveyance member, a rotary disk whose workpiece passing surface facing at least the work holding member is a surface with a large friction coefficient; and a work holding member provided so as to be movable forward and backward in a direction parallel to the conveyance direction of the conveyance member.

(Function) According to the technical means of the present invention (see FIGS. 1 and 2 below), the workpiece 3 is conveyed in one direction as shown by the arrow by the conveyance member 4 such as a belt conveyor,
For example, the end portion 3a of the workpiece 3 is used as a reference position that can be detected by a detection member, and, for example, a positioning reference line is set as an appropriate virtual line based on the needle position of the sewing machine (the drawing is When positioning along such a positioning reference line, a part of the workpiece 3 following the end 3a is passed over the rotary disk body 1, and this passing portion is passed over the rotary disk body 1. 1, a part of the work 3 is held between the workpiece 1 and the disk body, and the workpiece is movable forward and backward in the direction of line A-A in FIG. A holding member 2 is provided,
The end 3a can be positioned by controlling the forward and backward movement of the work holding member 2 by the detection member 5, which is arranged on the positioning reference line and detects the positional deviation of the end 3a with respect to the reference line. FIG. 2 illustrates the operating principle of the positioning. , that is, the traveling direction of the workpiece 3. Now let v be the velocity of an arbitrary point P on the straight line A-A parallel to the x-axis at a distance R from the x-axis on the surface of the rotary disc 1 rotating at a constant angular velocity ω, then the x-direction component of the velocity v and the components v _x and v _y in the y direction are expressed by the following equations.

v=・ω=R/cosθ・ω (1) v _x =v cosθ = (R/cosθ)ω cosθ=Rω (2) v _y =v sinθ(R/cosθ) ω sinθ=Rω tanθ (3) Any point P on the straight line A-A parallel to the x-axis
The component v _x in the x direction is proportional to R but is independent of θ, and the component v _y in the y direction changes with θ. As shown in FIG.
and the contact point between the work holding member 2 and the work holding member 2, and the speed of the conveying member 4 of the work 3 is set as V, and this speed V is the speed of the rotary disk body 1 in the x-axis direction at point P (vector in the x direction = v _x ) By setting the same speed as , it is possible to correctly position the end portion 3a of the workpiece 3 along the positioning reference line. That is, in FIG. 1, the workpiece 3 held between the workpiece holding member 2 and the rotary disk body 1 has a y-direction component v when the workpiece holding member 2 is located at point _P2 shown in the figure. The movement of _y is not performed at all according to the equation (3) v _y = Rωtanθ, where θ = 0, so v _y = ±0, and only the x-direction component v _x acts, so the positioning in the y-axis direction is The workpiece 3 moves in the x-axis direction in synchronization with the conveyance member 4 without any correction operation being performed. There is a positional deviation (correction amount) of d ₁ in the axial direction, and this is detected by the detection member 5, and the work holding member 2 is moved P ₂ according to the correction amount.
By moving from point to point _P3 , the component in the y direction shown in equation (3) v _y =Rωtanθ=OP ₂・ω・P ₂ P ₃ /
Due to OP ₂ =ω・P ₂ P ₃ , a correction force is applied to the end 3a in the direction where d ₁ =0, and thereby the positioning control of the end 3a is performed. Become. In addition, when there is a positional deviation in which the end portion 3a of the workpiece 3 overruns the positioning reference line by an amount _d2 in the y-axis direction, this is also detected by the detection member 5.
By moving the work holding member 2 from point P ₂ to point P ₁ according to the amount of correction, a correction force in the opposite direction is applied based on the same operating principle, and d ₂ = 0. By the correction in the direction, the end portion 3a is positioned along the reference line. At this time, since _v
Control operations relative to the positioning reference line can be achieved reliably and smoothly. In the above explanation, the operation of the present invention was explained in detail by setting an imaginary line called a positioning reference line, but of course such a reference line does not actually exist, and when implementing the present invention, it may be necessary to set a virtual line called a positioning reference line. Just set it. Further, in FIG. 1, for convenience of explanation, the positioning reference line and the x-axis are coaxial, but of course they may not be coaxial and may be set as appropriate.

(Example) A specific example of the technical means according to the present invention will be described with reference to FIG. 1 and FIGS. 3 and 4.

For example, a flexible and flat workpiece 3 such as knitted fabric can be conveyed in a direction parallel to the positioning reference line in this example by a belt conveyor or other suitable conveyance member 4, and the end portion 3a to be positioned is A rotating disc body 1 is mounted on the side via a rotating shaft 6,
It is provided so as to be rotatable in the clockwise direction in the figure, and supports a part of the workpiece including the end portion 3a so as to be freely passed therethrough. The center of the rotary disc body 1 is on the x-axis, and the work clamping surface of the disc body 1 corresponding to the work holding member 2 is an annular clamping surface 7 that is concentric with the center of the disc body and has a large friction coefficient in the illustrated example. be done. The holding surface 7 may be formed by pasting hard rubber with an uneven surface, by pasting a non-woven fabric, or by making the holding surface 7 a satin surface when a metal plate is used as the board 1. Use. This is the workpiece 3 between the workpiece holding member 2
This is because it is necessary to provide a frictional force to move a required portion of the disk at a speed V, and in this example, the surface of the disk other than the clamping surface 7 is a smooth surface 8. Moreover, the driving means for the rotating shaft 6 is arbitrary. The workpiece holding member 2 that holds the workpiece 3 in correspondence with the rotary disk body 1 is
As illustrated in FIGS. 3 and 4, the nip ball 9 is comprised of a nip ball 9 that makes point contact with the clamping surface 7 of the rotary disk body 1, and a holder 10 that rotatably holds the ball 9. The nip ball 9 is rotatably held in the casing 11 of the holder 10 via the seat 12, and is elastically supported by a spring 13, so that it can absorb the thickness of the workpiece 3. Further, this work holding member 2 is moved to the conveying member 4.
In order to move forward and backward along the line A-A parallel to the conveyance direction of the work 3,
4, a screw shaft 15 and a guide shaft 16 are installed parallel to the A-A line, and a holder 10 for the nip ball 9 is installed.
By slidably fitting a part of the holder 10 onto the guide shaft 16 and screwing a nut part 17 formed on a part of the holder 10 onto the screw shaft 15,
Through the forward and reverse rotation of the screw shaft 15, the holder 10
It is possible to freely move forward and backward. The forward and reverse rotation of the screw shaft 15 is performed using a servo motor 18 or the like.

At this time, the nip ball 9 in this embodiment is made of a metal body with a smooth surface and a small coefficient of friction in order to reduce the friction with the workpiece 3 as much as possible, and is rotatable as shown in the figure. may be fixed, but especially in the case of fixed, it is preferable to use a metal ball or the like with a smooth surface in order to reduce the coefficient of friction.
There are no particular restrictions on the shape, material, etc. of such a work holding member, and if it is rotatable, the contact surface may be made of a material with a small friction coefficient or a material with a large friction coefficient. Naturally, the use of such materials is also within the scope of the present invention, since the frictional force is reduced. Further, when the workpiece holding member 7 is fixed, a member having a small surface friction coefficient can be selected and used as described above.

In the present invention, a detection member 5 such as a linear sensor, a phototube, an air sensor, or a photo sensor is positioned above the positioning reference line to control the advance and retreat of the work holding member 2.
are arranged via the bracket 14, arm 19, etc.

According to this embodiment, when a relatively soft and flat workpiece 3 such as knitted fabric is transported by the transport member 4 to the sewing machine side, for example, a straight edge is formed in the middle of the transport path. The positioning is performed so that the section 3a is correctly aligned with a positioning reference line (in this example, an imaginary line protruding a certain distance from the sewing machine needle position) that is appropriately set based on, for example, the needle position of the sewing machine. The workpiece holding member 2 is P ₂ in Fig. 1.
Assume that it is set in the position. Rotary disk body 1
Of course, it is rotated at the beginning of conveyance. speed V
The workpiece 3 being conveyed advances, and when the position of the end portion 3a with respect to the reference line is detected by the detection member 5, and the position correctly matches the reference line, the rotating plate moves as described above. The body 1 is rotating at a constant angular velocity ω, and the x-direction component v _x on the line segment A-A parallel to the x-axis is always set to the same velocity as the velocity V, so the point P ₂ The workpiece 3 held between the workpiece holding member 2 and the rotary disk body 1 at
Since only _x acts, it moves straight in the transport direction. If the position of the end portion 3a detected by the detection member 5 is in a state of being retracted to the inside side with respect to the x-axis or a state of being over the side of _the , d ₂ amounts), the screw shaft 15 is rotated in either the forward or reverse direction via the servo motor 18 in response to a command from the detection member 5, so that the work holding member 2 set at the P ₂ point is In the case of the d ₁ side, it is displaced from the P ₂ position to the P ₃ position, and in the case of the d ₂ side, it is displaced forward or backward from the P ₂ position to the P ₁ position, respectively, which produces a y-direction component v _y , and d ₁ = 0, d ₂ = 0 acts, and the work holding member 2 moves from P ₃ to P ₂ and from P ₁ to P ₂ , and a positioning operation is obtained to align the end 3a with the reference line. , _P2 position is the correction completed position, and in this way the end portion 3a can be positioned with respect to the positioning reference line. still
The two points P ₁ and P ₃ always change with respect to the fixed point P ₂ depending on the amounts of d ₁ and d ₂ . FIG. 1 shows the relationship between the rotary disk body 1 and the workpiece holding member 2 when the end portion 3a of the workpiece 3 is deviated from the positioning reference line by an amount d, that is, it is retracted inward. At this time, the workpiece holding member 2 is moving to the _P3 position and making corrections. In this way, as the end portion 3a gradually approaches the reference line, the work holding member 2 moves from the _P3 position toward the _P2 position, and the correction operation is performed properly.

This embodiment exemplifies positioning using the straight edge 3a as a reference position that can be detected by the detection member, but of course it does not stop at the edge of the fabric.
If there is a reference position inside the workpiece 3 that can be detected by the detection member 5, the reference position can be detected and similarly positioned. Further, as such a reference position, if a linear shape or a curved shape that can be detected by the detection member 5 such as a mark, a weave, a seam, etc. on the workpiece 3 is exposed, this can be used. It can be detected and positioned. The same applies even if the end portion 3a is curved. Further, in the embodiment, the detection member 5 detects one point, but it is also possible to use a two-point detection method, and the movement of the workpiece holding member 2 via the detection member 5 may be performed by a mechanism other than the illustrated example. The shape of the rotary disc body 1 may be circular or polygonal, and the command from the detection member 5 is generally transmitted by electrical signal means, but a mechanical transmission structure may also be used.

(Effects of the Invention) The present invention is excellent in that required portions of the workpiece 3 can be positioned extremely smoothly and accurately. That is, the work 3 is transported to the target position by the transport member 4, and the part to be positioned is held between the rotary disk body 1 and the work holding member 2, and the work holding member 2 is advanced and retreated on the disk body 1. Accordingly, the part to be positioned can be easily corrected without interfering with the workpiece conveyance movement. Moreover, this corrective movement is performed by the rotating disk body 1.
Because it utilizes the rotational movement of
In addition, it is possible to accurately correct the positioning to the reference position without causing deviation, waving, distortion, etc. that tend to occur in the workpiece. In addition, only the rotary disk body 1, the workpiece holding member 2, and the detection member 5 for detecting the positional deviation of the positioning portion are sufficient as the necessary structures, and the difference between the conveying speed V of the conveying member 4 and the angular velocity ω of the rotary disk body is sufficient. All that is required is to provide certain conditions, and there is no need for any complicated structure, mechanism, or operation, and the problems of conventional methods can be solved.

[Brief explanation of drawings]

Fig. 1 is a plan view of an embodiment of the device of the present invention, Fig. 2 is an explanatory diagram of the principle of operation, Fig. 3 is a side view of an embodiment of the device, and Fig. 4 is a side sectional view of the main part of the work holding member. be. 1...Rotating disk body, 2...Work holding member, 3
...Work, 3a... Positioning end, 4... Conveying member, 5... Detecting member.

Claims (1)

[Scope of utility model registration request] A conveyor member for positioning workpieces such as various types of fabrics, which conveys the workpieces in one direction; and a rotary disk body having at least a workpiece passing surface facing a workpiece holding member having a large coefficient of friction. , a workpiece holding member is provided facing the rotary disk body to clamp the workpiece and is movable back and forth in a direction parallel to the conveyance direction of the conveyance member via a workpiece displacement detection member. Workpiece positioning device.