JPS6335287A - Differential belt feed apparatus of sewing machine - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to a belt feeding device for a sewing machine, and in particular, in a direction orthogonal to the cloth feeding direction, belt feeding devices are arranged on both sides of a needle hole in parallel to the cloth feeding direction and above and below. The feed belts are individually driven at the same or different speeds to enable linear feed or curved feed.

[Conventional technology and problems]

This technology uses a belt to feed the fabric of a sewing machine, and two fabric feeding belts are placed parallel to each other on both sides of the needle hole.
For example, there is one described in Japanese Utility Model Application Publication No. 58-143676.

However, the two cloth feed belts of this device are commonly hung on a pulley as a single rotating body that is attached to the drive motor, and the feed amount of the two belts is the same. In this case, the belt was fed in a straight line in the longitudinal direction, and curved feeding was not possible. Especially when sewing at a certain distance from the curved edge of the fabric, or when sewing two pieces of fabric one above the other and making cotton while aligning the fabric edges,
It has been difficult to increase sewing efficiency, as the worker has to move the cloth from side to side as needed while sewing, and high-speed sewing requires a high level of skill.

This invention solves the above-mentioned problems by disposing two feeding belts at the bottom or two feeding belts at the top and bottom, and driving each belt separately to enable differential feeding. To automatically enable linear feeding or curved feeding, the object is to be able to sew according to the shape of the edge of cloth or to sew while matching the edges of overlapped cloth.

[Means for solving problems]

For this reason, a drive means is provided for each of the two lower feed belts, and the differential feed amount of the feed belts by this drive means is controlled in conjunction with a frost detection means for detecting the shape of the edge of the fabric. It automatically performs linear or curved feeding according to the end shape.

In addition, while detecting the deviation of the edges of cloth stacked one above the other, feeding belts are installed above and below corresponding to the upper and lower cloths, allowing each cloth to be fed not only in a straight line but also in a curved line.
This driving means is controlled so as to correct the left and right overlapping deviation of the upper and lower cloths.

〔Example〕 Hereinafter, one embodiment of the present invention will be described based on the drawings.

In this embodiment, belt feeding is used to feed two pieces of cloth stacked one above the other.

In Figures 1 and 2, 1 is the machine frame of the sewing machine head, 2 is the sewing machine bed, and 3 is a needle bar that moves up and down in conjunction with a main shaft (not shown) and has a needle 4 attached to its lower end.

Reference numeral 5 denotes a presser foot which has a hole 6 in the center through which the needle 4 is inserted and presses an elastic force against the needle plate, which will be described later.Reference numeral 7 is attached to the bed 2 and has a needle hole 8 through which the needle 4 is inserted vertically. The throat plate 9 is a hook that houses a bobbin.

A is an endless upper feeding belt placed on the left side of the hole 6 in the feeding direction, and B is an endless upper feeding belt placed on the right side of the hole 6. Pulleys 20 are rotatable individually around the identification axis and are mounted below the presser foot so as to move back and forth in the cloth feeding direction around the hole 6. z.

2ob, 21a, 21h, and pulleys 24a, 24A arranged at the tips of tension adjustment levers 23a, 23A, which are attached to the head of the sewing machine and are rotatably biased by a reciprocating lever 22(Z, 2')b. The drive boo is mounted on the head of the sewing machine and is pivoted to a drive means 63, 64 (Fig. 10) that can be driven intermittently, such as a stepping motor that feeds and drives the belt! J
25c, 2!5I5 and the auxiliary boo') 26a, 2 mounted on the head machine frame 1 to guide the upper feed belts A and B.
The 6th hour and the evening have been passed.

C is an endless bottom feed belt placed on the left side of the needle hole 8 in the feeding direction; D is an endless bottom feed belt placed on the right side; these bottom feed belts c and I) are perpendicular to the cloth feeding direction. (1) Rotatably about a fixed axis, the needle hole (8) is arranged in the lower machine frame in the forward direction of the cloth feed direction, and is arranged in the cloth feed direction (1) on the same axis perpendicular to each other. Front boo attached so that it can rotate! J30c, 30d, and the tip of the tension adjustment lever 33, which is arranged on the machine frame below the bed 2 behind the needle hole 8 in the cloth feeding direction, and is biased to rotate by a spring 61 attached to the machine frame. Rear pulleys 34 are individually rotatably mounted on the same axis perpendicular to the cloth feeding direction.
cr 54 d, drive boos IJ35c, 35d pivoted to drive means 65, 66 (Fig. 10) that can be driven intermittently, such as stepping motors that feed and drive these lower feed belts C1D separately, and lower feed belts C2D. An auxiliary pulley 36 c + is attached to the machine frame to guide the
36 tL and the bridge have been passed.

The driving means 65 and 66 are needle position detecting means 62 which will be described later.
(Figure 10) When it is detected that the needle 4 is located above the cloth, it can be driven, and the driving amount (fabric feed amount) is controlled by differential feed based on the feed amount setting by the operator. It is adjusted by the control of the control means 6o.

Reference numeral 40 denotes a lifting means arranged below the bed 2 so that the lower feed belts c and D can be moved above the throat plate 7. This elevating means 40 has a central portion arranged parallel to the longitudinal direction of the belt so as to contact the lower surface of the lower feed bells (:', n) arranged on both sides of the needle hole 8, and one end perpendicular to the feeding direction. an elevating arm 43 that is loosely fitted onto a support shaft 41 and has a bifurcated portion at the other end so as to be rotatable up and down about one axis; a vertical feed shaft 42 that is linked to the main shaft; It consists of a lever 43 that is pivoted, and a square piece 45 that engages with the forked portion of the lifting arm 43 and is rotatably attached to the lever 43.

Due to its relationship with the main shaft, this elevating means 40 pushes the lower feed belt C2D upward when the needle is at a position above the cloth, and cooperates with the upper feed belts A and B to position the belt above the cloth. (Fig. 6) and a position below the belt (Fig. 4) where the cloth is released while the needle is stuck in the cloth.

In Figs. 5 to 7, 50 is a cloth detecting means attached to the bed 2 on the right side of the workers in bells) B and D, and the cloth is stacked one above the other by a reflecting plate 51 having a light-reflecting surface on both sides. Separate the light emitting diode P1 on the upper side to the left of the worker.
．． A light emitting diode P2 is mounted on the right side facing the reflecting plate 51, and a light emitting diode ps is mounted on the left side of the lower surface of the reflecting plate 51.
A light emitting diode P4 is mounted on the right side with the light emitting diode P4 facing the reflecting plate 51. The photo 60 that detects the detection light reflected from the reflector 51 corresponding to each light emitting diode is mounted on the bed 2 at a distance rearward in the cloth feeding direction from the above-mentioned upside-down bell) and 4-7) and upwardly from the bed 2. 2 is a separating plate placed in parallel with the upper and lower cloths, and is interposed between the upper and lower cloths to separate the cloths into upper and lower parts.

FIG. 10 is a control product diagram of this embodiment.

Reference numeral 60 has a memory for storing control information and input information of the present device, and control means for issuing each drive signal based on the memory; 61 is a start switch that is linked to the starting pedal of the sewing machine; and 62 is related to the rotational position of the main shaft of the sewing machine. needle position detection means for detecting the lower position where the needle is stuck into the cloth and the upper position where the needle is above the cloth; 50 denotes the detection points 51 to S4;
It is a cloth detecting means that emits a detection signal at
This is the source of input information to 0.

63 and 64 are driving means for driving the upper belts A and B, respectively, 65 and 66 are driving means for driving the lower belts) (? and D, respectively), and 67 is a presser foot that allows the presser foot 5 to move upward. A lifting solenoid 68 is a main motor that rotates the main shaft of the sewing machine, and is driven together with drive means 63 to 66 and a presser foot lifting solenoid 67 by a drive signal from the control means 60.

8 and 9 show an example of sewing, in which the edge of the cloth fed by the lower feed bell) (?, D) is detected by the detection means 5.
While detecting at the detection points 53 and 54 of 0, the lower feed belt C,
This is to drive D appropriately.

S3 detects the presence or absence of cloth, and S4 detects the presence or absence of a cloth edge, and the distance W between the extension line (reference line) in the cloth feeding direction from the detection point S4 and the needle hole 8 is the same as the cloth edge and the sewing. Divide the cloth so that it is spaced from the n line.If the detection point S4 is cleansed as shown in Fig. 8, the lower feed bell) C, I
), the drive 'f stages 65 and 66 are driven so that the relative feed amount is differentially fed with c (d).

To explain this from the start of the sewing work of the sewing machine in FIG. 67 is turned on and the presser foot 5 is raised. When the operator places the upper cloth on the detection point S1 and the lower cloth on the detection point SX, the control means determines that the cloth has been set, and further when the start pedal is depressed and the start switch 61 is turned on. Then, the presser foot lifting solenoid 67 is turned off, the presser foot 5 is lowered, and the sewing machine motor 68 is driven to start sewing.

At this time, when the needle up position signal is received from the needle position detection means 62, the elevating arm 43 of the elevating means 40 moves the lower feeding belt C2D to the belt upper position to sandwich the upper and lower fabrics, and the belt driving means 63 to 66 Drive corresponding to the differential amount is performed based on the escaped cloth feed amount P.

When the needle down position signal is received, the elevating arm 43 moves to the belt below position, and the upper and lower fabrics are pressed against the throat plate 7 by the elastic force of the presser foot 5, and a seam is formed. When the edge of the cloth is caught at the detection point S1 and/or S4 and the strength of the detection signal is at an intermediate level, the feed amounts of the upper and lower feed belts A, B and/or C, D are equal to the feed amount P. The cloth is fed in a straight line.

When the cloth is applied to the detection points s2 and/or s4 and a cloth detection signal is output, the upper/lower feed belt A is moved.

The feed amount of B and/or C, D is a> as a differential feed.
If b and/or c'> d, and conversely, if the cloth detection signal is not output, differential feed is performed.
or c (tL), and the cloth is fed in a curve while maintaining the set feed amount p.

In this way, move the lower cloth together at a certain distance W from the edge of the cloth.
This makes it possible to sew while keeping the edges of the fabric in place, making it possible to align the top and bottom edges of the fabric.

As sewing progresses, the detection point S1 or S3 of the detection means 50
When the cloth runs out, the control means 60 determines that the sewing is finished, stops the sewing machine motor 68, and cuts the thread.

In the above embodiment, a case was explained in which the fabric feed belts are arranged vertically to align stacked fabrics. However, for a piece of fabric with a curved edge, When sewing parallel to the edge of the fabric while maintaining the interval, it is possible to do so by using the following configuration.

That is, by disposing the feed belt only at the bottom and removing the upper feed belts A and B, when the elevating arm 43 moves to the position above the belt, the feed belt C2I) cooperates with the lower surface of the presser foot 5 to move the cloth. The cloth detection means 50 includes light emitting diodes ps, p4 and a phototransistor (!6+
The edge of the cloth is detected by using only Q', and the belt driving means 65 is activated in response to this cloth detection signal as described above.
．． 66 are driven separately and differentially fed as appropriate.

〔Effect of the invention〕

The structure and operation of the present invention are as described above, and by arranging two lower feed belts in parallel and making it possible to drive each separately, it is possible to feed the cloth in a curved line, and by increasing the differential amount, it is possible to feed the cloth in a curved manner. Curvilinear feed is also possible.

By controlling the feed pattern of the two feed belts, it is possible to simultaneously feed the cloth and control the direction of the cloth. Compared to the case where separate feeding direction control devices are provided for each, no excessive force is applied to the cloth especially during steep curve feeding, and extremely smooth curve feeding can be achieved.

Furthermore, by combining this driving means with a cloth detecting means, it is possible to read the shape of the cloth edge and automatically sew at high speed while maintaining a constant distance from the cloth edge shape.

In addition, by arranging this feeding belt at the top and bottom, it is possible to feed the upper and lower cloths in a curved line separately, and by detecting the cloth edges of each upper and lower cloth and controlling the driving means, it is possible to prevent the overlapping misalignment of the upper and lower cloth edges. It is possible to automatically correct and overlay accurately, and also to sew while maintaining a predetermined distance from the edge of the fabric.

[Brief explanation of drawings]

Fig. 1 shows a sewing machine according to an embodiment of the present invention, and Fig. 2 shows a sewing machine according to an embodiment of the present invention.
FIG. 9 is a diagram showing the position of the elevating arm above the belt, FIG. 4 is a diagram showing the position below the belt, FIG. 5 is a diagram showing the arrangement of the fabric detection means and the separating plate, FIG. 6 is a perspective view of the cloth detection means, and FIG. 7 is a perspective view of the cloth detection means shown in FIG.
An X-ray sectional view, FIGS. 8 and 9 are diagrams for explaining the moving direction of the cloth, FIG. 10 is a control block diagram, and FIG. 11 is a control flowchart.

Claims (2)

[Claims] (1) A needle bar is supported on the machine frame so as to be movable up and down in conjunction with the main shaft of the sewing machine, and a needle with a thread attached to its lower end is placed horizontally opposite the lower surface of the presser foot. a needle plate having an open needle hole through which the needle is inserted, a needle position detection means for detecting a lower device in which the needle is stuck into the cloth and an upper position in which the needle is above the cloth in relation to the rotational position of the main shaft; The presser foot is capable of protruding from the upper surface of the throat plate opposite to the lower surface of the presser foot, and is arranged parallel to the cloth feeding direction along both sides of the needle hole in a direction orthogonal to the cloth feeding direction, and can be fed separately in the longitudinal direction. and two lower feeding belts, and the needle position detecting means so that the upper surface of the lower feeding belt is higher than the upper surface of the throat plate when in the upper position, and the upper surface of the belt is lower than the upper surface of the throat plate when in the lower position. a lifting means for raising and lowering the lower feed belt in relation to the vertical position of the needle; and a means for driving the two lower feed belts separately when the needle position detecting means indicates the upper position, and when the needle position is at the lower position, It is equipped with a driving means for stopping the driving of the two lower feed belts, and two cloth detection points in a direction orthogonal to the cloth feeding direction in front of the cloth feeding direction, and one of the detection points detects the presence or absence of cloth. a cloth detecting means disposed on the machine frame to detect the presence or absence of a cloth edge at the other detection point to determine the deviation of the cloth in the left-right direction; A differential belt feeding device for a sewing machine, comprising: control means for individually controlling the drive amount of the drive means. (2) A needle bar is supported on the machine frame so as to be movable up and down in conjunction with the main shaft of the sewing machine, and has a needle with a thread attached to its lower end, and the needle bar is arranged horizontally opposite the lower surface of the presser foot. a needle plate with an open needle hole through which the needle is inserted; a needle position detection means for detecting a lower position where the needle is stuck into the cloth and an upper position where the needle is above the cloth in relation to the rotational position of the main shaft; The presser foot is capable of protruding from the upper surface of the throat plate opposite to the lower surface of the presser foot, and is arranged parallel to the cloth feeding direction along both sides of the needle hole in a direction orthogonal to the cloth feeding direction, and can be fed separately in the longitudinal direction. and two lower feed belts arranged parallel to the cloth feeding direction so as to face the two lower feed belts on the lower surface of the presser foot, and supported on the presser foot so as to be movable independently in the longitudinal direction. The two upper feed belts move up and down together with the presser foot so as to be able to approach and separate the lower feed belt, and the needle position detection means detects that the top surface of the lower feed belt is lower than the top surface of the throat plate when in the upper position. elevating means for raising and lowering the lower feed belt in relation to the vertical position of the needle so that the upper surface of the belt is lower than the upper surface of the throat plate when the needle is in the lower position; Top/Bottom 4
It is equipped with a driving means for driving each book belt separately and stopping the driving of the upper and lower feeding belts when they are in the lower position, and two detection points in the front direction in the cloth feeding direction in a direction perpendicular to the cloth feeding direction, and These are provided separately on each piece of cloth stacked one above the other, arranged so that each cloth can be detected separately, and one detection point detects the presence or absence of the cloth, and the other detection point detects the presence or absence of a cloth edge. A cloth detection means is arranged on the machine frame so as to determine the deviation in the left and right direction of the cloth edges stacked one above the other, and four upper and lower belts are arranged to correct the deviation of the cloth edges determined by the cloth detection means. A differential belt feeding device for a sewing machine, comprising: a control means for separately controlling the drive amount of each;