JPH054448B2 - - Google Patents

Description

[Detailed Description of the Invention] Purpose of the Invention (Industrial Application Field) This invention is an object of the present invention, in which a belt wound between a pair of cone drums is rotated at a constant speed through a gear system as the number of roving layers wound around a bobbin increases. This invention relates to a driving device for a roving frame equipped with a speed change mechanism that changes the rotational speed of a bottom cone drum by sliding a belt shifter that is movably provided in conjunction with a long rack that is moved pitch by pitch.

(Prior Art) In recent years, in order to improve the productivity of roving frames, there has been a trend toward higher speeds and larger packages of roving frames. The centrifugal force that acts on the roving during winding increases as the bobbin diameter (that is, the amount of winding) increases and the bobbin rotation speed increases. It is necessary to keep the value below a certain value without causing any adverse effects. Conventionally, the roving was wound by keeping the spinning speed constant and changing the speed of the machine so that the rotational speed of the bobbin decreased as the bobbin diameter increased. In this method, the centrifugal force acting on the roving reaches the maximum allowable value near the end of winding when the bobbin diameter reaches its maximum, but the centrifugal force acting on the roving reaches the allowable limit when the bobbin diameter begins to wind. It is a much smaller value. Therefore, the machine is operated at high speed in the early stage of winding, when a large centrifugal force is not generated even if the machine is operated at high speed, and as the bobbin diameter increases, the operating speed of the machine is gradually reduced to improve productivity. Spinning machines are from the Showa era
This was proposed in Special Publication No. 47-42855, published on October 30, 1947, and Publication No. 44675, published in 1972.

The former device is rotated regularly by a predetermined amount when the bobbin rail is switched up and down, and is moved through a pinion that meshes with a long rack equipped with a belt shifter that slides a belt wound between a pair of cone drums. A variable resistor is attached to the adjustment shaft through which the rotation of the upright shaft, which has the effect of moving the long rack in fixed pitch increments, is transmitted through the clutch, and the variable resistor is not operated from the start of winding to a predetermined bobbin diameter. The motor is driven at a constant high speed to rotate the flyer at a high speed, and when the bobbin diameter reaches a predetermined diameter, the clutch is connected by a limit switch operated by a dog provided on the long rack, and the upright shaft is rotated. maintaining a state in which rotation is transmitted to the adjustment shaft;
Thereafter, the rotational speed of the motor is reduced by increasing the resistance of the variable resistor, thereby reducing the rotational speed of the fryer. That is, in this apparatus, as shown by the solid line in FIG. 6, the number of revolutions of the flyer is rotated at a constant high speed from the start of winding to a predetermined bobbin diameter, and then decreases as the bobbin diameter increases. In this device, when changing the rotation speed of the fryer, it is only possible to change it proportionally by replacing the motor pulley, etc., as shown by the chain line in Figure 6, and in order to significantly change the gradient of deceleration, it is possible to change it proportionally. There is an inconvenience that it must be replaced with a variable resistor.

On the other hand, the latter device uses a long rack equipped with a belt shifter that moves the belt wound between a pair of cone drums, and the centrifugal force that acts on the winding device due to the rotation of the bobbin causes changes in the bobbin diameter. A cam plate having a speed change curve that maintains a constant value regardless of the change in speed is fixed, and a converter such as a sliding resistor that converts changes in physical quantities into changes in electrical quantity or voltage is in contact with the cam plate. It is fixed to the frame and the number of rotations of the roving frame is continuously changed as the long rack moves. However, since the rotational speed of the fryer, that is, the change in the rotational speed of the motor, is determined by the shape of the cam plate, depending on changes in the motor pulley, etc., the rotational speed of the fryer can only be changed proportionally, as shown in Figure 7, similar to the above device. cannot be changed, and in order to obtain the optimum speed change curve as the spinning conditions change, there is a disadvantage that a large number of cam plates must be prepared and the cam plates must be replaced each time.

(Problems to be Solved by the Invention) The problems to be solved by the present invention are the fixation of the speed change conditions of the fryer in conventional devices, the preparation and storage of replacement parts necessary to change them, and the time of replacement. This is due to the complexity of the work.

Structure of the Invention (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides an induction motor that is driven at variable speeds via an inverter as a main motor, and generates a speed change signal to the inverter. The circuit includes a deceleration amount detector which is operated in conjunction with the intermittent movement of the long rack and whose resistance value is sequentially changed and set so as to reduce the voltage that is the speed change signal to the inverter, and a rotation speed at the start of winding. The present invention adopts a configuration in which a winding start value setter is provided to set the winding start value, and a proportional width setter is provided to cooperate with the deceleration amount detector to expand the width of decrease in the voltage.

(Function) In this invention, the rotational speed at the start of winding is adjustable by the winding start value setting device, and the speed is reduced by intermittent movement of the long rack, which is moved by a predetermined amount when the bobbin rail is switched up and down. The resistance value of the variable resistor serving as a detector is sequentially changed linearly, and the reduction width of the voltage, which is the speed change signal to the inverter, is determined by the resistance value and the resistance value of the variable resistor constituting the proportional width setting device. The rotational speed of the main motor, that is, the rotational speed of the flyer, is linearly reduced in accordance with the determined movement of the long rack, that is, the increase in the roving layer. The amount of change in the deceleration amount detector is determined by the moving pitch of the long rack, so it remains constant even when spinning conditions are changed, but by changing the resistance value of the proportional width setting device, the voltage that is the speed change signal to the inverter can be changed. The amount of decrease is changed. That is,
By changing the resistance values of the winding start value setter and the proportional width setter in response to changes in spinning conditions, the amount of deceleration of the rotational speed of the main motor, that is, the flyer, can be freely set.

(Example) Examples 1 to 5 which embody this invention will be described below.
This will be explained according to the diagram. As shown in FIG. 1, the front roller 1, flyer 2, and top cone drum 3a are driven by a common main motor 4 through rotation transmission means (indicated by thick solid lines) such as a gear train or a timing belt, and are driven by a common main motor 4. The rotation from the main motor 4 and the rotation from the bottom cone drum 3b, which is rotated at variable speed by the top cone drum 3a via the belt 6, are combined and transmitted by the differential mechanism 7. . A long rack 9 to which a belt shifter 8 is fixed at one end is slidably mounted in a groove 10a of a guide member 10 extending parallel to the axes of the cone drums 3a, 3b. As is well known, the long rack 9 has a weight of 11.
Upright shaft 1 rotates due to the lowering of
At the lower end of the upright shaft 12 is a gear that meshes with a gear 16 fixed to the shaft of a ratchet wheel 15 that rotates regularly by a predetermined amount when the bobbin rail 14 is switched up and down. 17 is fixed. An adjustment shaft 18 is rotatably supported in parallel with the upright shaft 12 near the upright shaft 12, and a belt 20 is wound around between pulleys 19 fitted to the upright shaft 12 and the adjustment shaft 18, respectively. It is designed to be rotated in conjunction with the upright shaft 12 via the upright shaft 12. A deceleration amount detector VR1 consisting of a variable resistor is connected to the lower end of the adjustment shaft 18.

The main motor 4 is constituted by an induction motor driven at variable speed via an inverter INV, and the inverter INV is controlled by a controller 21 electrically connected to the deceleration amount detector VR1. The controller 21 cooperates with a winding start value setter VR2 consisting of a variable resistor for setting the rotational speed at the start of winding, and the deceleration amount detector VR1 to generate a voltage which is a speed change signal to the inverter INV. It is composed of a proportional width setting device VR3 consisting of a variable resistor that sets the reduction width of , and amplifiers 22 and 23. Deceleration amount detector VR1, winding start value setting device VR
2. The proportional width setter VR3 and the amplifiers 22 and 23 are electrically connected as shown in FIG.

Next, the operation of the apparatus configured as described above will be explained. The inverter INV changes the rotational speed of the main motor 4 based on the speed change signal from the controller 21, but the speed change signal from the controller 21, that is, the input voltage to the inverter INV is controlled by the winding start value setting device VR2 and the deceleration amount detector. It is determined by the resistance values of VR1 and proportional width setting device VR3. The output voltage set by the winding start value setter VR2 to a value corresponding to the winding start rotation speed is amplified to E ₀ by the amplifier 22 and output. At the start of winding, the deceleration amount detector VR1 is set at a position where the output voltage to the next amplifier 23 is _E0 . When the roving machine starts operating and the ratchet wheel 15 is regularly rotated by a predetermined amount each time the roving layer increases, that is, the bobbin rail 14 is switched up and down, the gears 16, 17, upright shaft 12, and pulley 19, belt 20, adjustment shaft 1
8, the value of the deceleration amount detector VR1 is changed by a predetermined amount. As a result, the output voltage E to the amplifier 23 decreases, and the rotational speed of the main motor 4 driven via the inverter INV is reduced. Since the amount of rotation of the upright shaft 12 is always constant, the deceleration amount detector VR1 changes linearly as shown in FIG. The input voltage E to the amplifier 23 is determined by the resistance value of the deceleration amount detector VR1 and the proportional width setting device VR3, and the slope of decrease of the voltage E can be changed by changing the resistance value of the proportional width setting device VR3. can. As shown in Fig. 5, at the end of winding, the resistance of the deceleration amount detector VR1 is R11 on the amplifier 22 side,
Since the proportional width setter VR3 side is R12, the voltage E at the end of winding is E = E ₀ × (R12 + R3) / if the resistance value of the proportional width setter VR3 is R3.
(R11+R12+R3), and if the resistance value of proportional width setting device VR3 is R13, E=E ₀ × (R12+R13)/
(R11+R12+R13), and the slope of decrease in voltage E changes as shown in FIG. Although it is possible to change the gradient of decrease in the voltage E by changing the amount of change in VR1, it is necessary to replace the deceleration amount detector VR1 each time, which is very troublesome. In this device, it is possible to freely change the decreasing slope of the voltage E by changing the resistance value of the proportional width setting device VR3. Further, the rotational speed at the start of winding can be easily changed by changing the value of the winding start value setter VR2 to a corresponding value. Therefore, the winding state of the roving around the bobbin, that is, the hardness, can be adjusted to a desired state. In addition, by changing the decreasing slope of the voltage E, the winding tension at the beginning and end of winding can be changed, and it is also possible to wind the material so that the center part is hard and the outside part is soft.

It should be noted that the present invention is not limited to the above-mentioned embodiment. For example, a sliding resistor may be used as the deceleration amount detector VR1, and the resistance value may be changed as the long rack 9 moves.

Effects of the Invention As detailed above, according to the present invention, the rotational speed of the roving frame is increased from the winding start position to the winding end position within the winding limit of the roving machine taking into account centrifugal force. It is possible to increase the production volume because the machine rotation speed can be decreased sequentially, and the rate of decrease in machine rotation speed can be easily set according to the spinning conditions, making it suitable for multi-product production. The winding state of the roving around the bobbin, that is, the hardness, can be adjusted to a desired state, and it is also possible to wind the roving thread hard at the center and soft at the outside.

[Brief explanation of the drawing]

1 to 5 show an embodiment embodying the present invention, in which FIG. 1 is a schematic front view, FIG. 2 is an electric circuit diagram, and FIG. 3 shows voltage changes caused by a deceleration amount detector. 4 is a diagram showing the action of the proportional width setting device, FIG. 5 is an electric circuit diagram showing the state of the deceleration amount detector at the end of winding, and FIG. 6 is a diagram showing the fryer rotation speed in the conventional device. A diagram showing the relationship between the flyer rotation speed and the bobbin diameter. FIG. 7 is a diagram showing the relationship between the flyer rotation speed and the bobbin diameter in another conventional device. Flyer...2, Main motor...4, Bobbin...
5, Long rack...9, Upright shaft...12, Adjustment axis...18, Controller...21, Amplifier...22, 23, Inverter...INV, Deceleration amount detector...VR1, Winding start value setting Equipment...VR
2. Proportional width setting device...VR3.

Claims (1)

[Claims] 1. A belt wound between a pair of cone drums is slid by a belt shifter, which is movable in conjunction with a long rack that is moved by a constant pitch through a gear system as the number of layers of roving wound around a bobbin increases. In a roving machine equipped with a speed change mechanism that changes the rotational speed of the bottom cone drum by moving the bottom cone drum, an induction motor that is driven at variable speed via an inverter is provided as the main motor, and the long rack is connected to a circuit that issues a speed change signal to the inverter. a deceleration amount detector that is moved in conjunction with the intermittent movement and whose resistance value is successively changed and set so as to reduce the voltage that is the speed change signal to the inverter; and a winding for setting the rotational speed at the start of winding. 1. An operating device for a roving frame, comprising: a starting value setting device; and a proportional width setting device for expanding the reduction width of the voltage in cooperation with the deceleration amount detector.