JPH0529901U - Band tightening force control device for high-speed binding machine - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a band tightening force control device in a high-speed binding machine capable of setting the band tightening force to a required strength and detecting completion of tightening. In a high-speed binding machine equipped with a binding unit 2 for supplying, tightening and binding a band, a driving means 4 for driving a cam shaft 3 of the binding unit 2 and a cam shaft 3 of the binding unit 2 are provided. When the rotation speed reaches the specified speed,
A camshaft rotation speed detecting means 5 for outputting a rotation speed detection signal A, and a limiting current value set internally based on the rotation speed detection signal A from the camshaft rotation speed detecting means 5 and supplied to the driving means 4. The current value detection means 6 for outputting the current limit value detection signal B when the supply current value reaches the limited current value and the current output from the current value detection means 6 are compared. A current cutoff signal C is output based on the limit value detection signal B to cut off the current supplied to the drive means 4.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a band tightening force control device in a high-speed binding machine in which a band of a bound object such as a newspaper is bound at high speed.

[0002]

[Prior Art]

 The binding machine is, for example, a known binding unit connected to a rotating machine such as a motor, a band supplying operation for banding the bound object, a band tightening operation for bringing the band into close contact with the bound object, and a band joining operation. A sealing operation is performed in which the bands are welded together while pressing the portions, and the excess portion is cut.

This binding unit has been driven and stopped by a switching operation of a clutch and a brake provided between the binding unit and the rotating machine.

[0004]

[Problems to be solved by the device]

 However, the band tightening operation of the binding unit that is driven and stopped by the clutch and brake is performed by the swinging action of the tightening arm housed in the binding unit, but the camshaft on the input side of the binding unit operates at a constant speed. Due to the rotation, the tightening force often exceeds the braking force of the brake and the band is often tightened abnormally.

This means that when a soft band is used, the frequency of band breakage increases, whereas when a hard band is used, the object to be bound is damaged and low-strength parts such as the tightening arm are damaged. There was a problem that the operation rate of the binding machine was significantly reduced.

In view of such conventional circumstances, the present invention has an object to provide a band tightening force control device in a high-speed binding machine having a simple structure and capable of performing smooth high-speed binding. ..

[0007]

[Means for Solving the Problems]

 The band tightening force control device in the high speed type binding machine according to the present invention is the high speed type binding machine having a binding unit for supplying, tightening and binding the band to the object to be bound. Driving means for driving the camshaft of the binding unit, camshaft rotation speed detecting means for outputting a rotation speed detection signal when the rotation speed of the camshaft of the binding unit reaches a predetermined speed, and this camshaft rotation Based on the rotation speed detection signal from the speed detecting means, the limit current value set inside is compared with the supply current value supplied to the driving means, and when the supply current value becomes the limit current value, A current value detection means for outputting a current limit value detection signal, and a current cutoff signal is output based on the current limit value detection signal output from the current value detection means to output the current supplied to the drive means. Cut off It is made of the flow blocking means.

[0008]

[Action]

 The band that binds the objects to be bound is tightened at a relatively high predetermined speed until it approaches the end region of the tightening operation.

After that, when the tightening operation of the band progresses and reaches the end area of the tightening operation, the tightening force in this case is detected as an electric signal, and this electric signal is processed by the central processing unit to drive the driving means. At the same time, the cam shaft stops, and the tightening of the band is quickly confirmed.

[0010]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

The tightening force control device 1 shown in FIG. 1 is a high-speed binding device including a binding unit 2 (see FIG. 2) for supplying, tightening, and binding a band to a bound object such as a newspaper. The present invention is applied to a bundling machine (entire illustration is omitted), and the rotation speeds of the driving means 4 for driving the cam shaft 3 of the bundling unit 2 and the cam shaft 3 of the bundling unit 2 become a predetermined speed. At this time, the cam shaft rotation speed detecting means 5 for outputting the rotation speed detection signal A, the limiting current value set inside based on the rotation speed detection signal A from the cam shaft rotation speed detecting means 5, and the drive Comparing with the supply current value supplied to the means 4, when the supply current value reaches the limit current value, the current value detecting means 6 for outputting the current limit value detecting signal B, and this current value detecting means Based on the current limit value detection signal B output from 6 , A current cutoff signal C for outputting the current cutoff signal C to cut off the current supplied to the drive means 4.

The cam shaft 3 and the driving means 4 are connected by a transmission mechanism 10 in which an endless belt 9 is wound around a pair of pulleys 8 as shown in FIG.

The cam shaft 3 is in contact with a plurality of cam switches (not shown) housed in the binding unit 2. Each cam switch has contacts at different displacement angles, and the band supply, band tightening, and band bonding are sequentially advanced by the input signal due to conduction of these contacts, and the cam shaft makes one rotation from the start. As a result, one cycle of the bundling operation is completed.

The driving means 4 is connected to a main controller 11 such as a servo amplifier by applying a servo motor.

The cam shaft rotation speed detection means 5 outputs a rotation speed detection signal A when the rotation speed of the cam shaft 3 of the binding unit 2 gradually becomes slower due to the tightening resistance of the band and reaches a predetermined speed. An encoder is used to compare the limiting current value and the supply current value in the current value detecting means 6.

The current limit value adjuster 12 sets the tightening force applied to the band to an appropriate strength and inputs the tightening force to the current value detection means 6, and at least one variable resistor is applied to detect the current value. It is connected to the means 6 and a current limit value commensurate with a desired tightening force can be set. In other words, when the band is tightened by the tightening arm (not shown) of the binding unit 2, the limit value of the current flowing through the drive means 4 is set to match the desired tightening force.

Reference numeral 13 is a central processing unit.

The camshaft rotation speed detecting means 5, the current value detecting means 6 and the current interruption means 7 are configured to include software which operates on the central processing unit 13.

Next, the operation of the above embodiment will be described.

When the activation command signal of the main controller 11 is input to the drive means 4, the rotational movement of the drive means 4 is converted into the rotational movement of the cam shaft 3 via the transmission mechanism 10.

Next, when the cam switch of the binding unit 2 is activated in accordance with the rotating operation of the cam shaft 3 and the band supply command signal from this cam switch is input to the band supply device (not shown), A fixed length of is supplied to the band guide surrounding the object to be bound, and when the tip of the band reaches the supply end, the arrival detection signal stops the band supply device.

After that, the tightening operation of the band shown in FIG. 3 is performed as the rotating operation of the cam shaft 3 progresses.

First, in step S1, it is determined whether or not a band tightening command signal is input. If yes, the tightening operation is started in step S2.

During the tightening operation, when the rotation speed of the cam shaft 3 is reduced by the tightening resistance of the band, the cam shaft rotation speed detecting means 5 determines in step S3 whether or not the rotation speed has reached the predetermined speed. To be done. If yes, the rotation speed detection signal A is output in step S4, and the detection operation of the current value detection means 6 is started in step S5 based on this rotation speed detection signal A.

When the tightening operation progresses and the supply current value detected by the current value detecting means 6 reaches the limited current value adjusted by the current limit value adjuster 12, the current value detecting means 6 determines in step S6. It is determined whether the supply current value has reached the limit current value. If yes, a process of outputting the current limit value detection signal B is performed in step S7, and based on the current limit value detection signal B, the current interruption means 7 outputs the current interruption signal C in step S8. ..

Subsequently, in step S9, the current cutoff signal C from the current cutoff means 7 is input to the drive means 4 via the main controller 11, whereby the camshaft 3 is stopped.

[0027]

[Effect of the device]

 The band tightening force control device in the high-speed binding machine according to the present invention comprises a driving means for driving the cam shaft of the binding unit and a cam for outputting a rotation speed detection signal when the rotation speed of the cam shaft reaches a predetermined speed. Based on the rotation speed detection signals from the shaft rotation speed detection means and the cam shaft rotation speed detection means, the current limit value is calculated by comparing the internally set limit current value with the supply current value supplied to the drive means. The camshaft is driven by the current value detecting means for outputting the detection signal and the current interrupting means for outputting the current interrupting signal based on the current limit value detecting signal output from the current value detecting means to stop the driving means. Since it is designed to stop, the completion of the tightening operation of the band of moderate strength by the binding unit can be accurately and promptly confirmed. Therefore, it is possible to speed up the bundling work and prevent the band from being broken and the band to be bound and the tightening mechanism from being damaged.

Further, since there is no need for a clutch and a brake, there are excellent advantages that the structure is simple and maintenance is very easy.

[Brief description of drawings]

FIG. 1 is a circuit diagram of a band tightening force control device in a high-speed binding machine.

FIG. 2 is a schematic view of a main part around a binding unit.

FIG. 3 is a flowchart illustrating a control operation of a tightening force control device.

[Explanation of symbols]

 1 Tightening force control device 2 Bundling unit 3 Cam shaft 4 Driving means 5 Cam shaft rotation speed detection means 6 Current value detection means 7 Current interruption means A Rotation speed detection signal B Current limit value detection signal C Current interruption signal

Claims (1)

[Scope of utility model registration request] 1. A high-speed binding machine including a binding unit for supplying, tightening, binding, etc., a band to an object to be bound, comprising: a driving unit that drives a cam shaft of the binding unit; When the rotation speed of the camshaft of the bundling unit reaches a predetermined speed, the camshaft rotation speed detection means outputs a rotation speed detection signal, and is internally set based on the rotation speed detection signal from the camshaft rotation speed detection means. A current value detecting means for outputting a current limit value detection signal when the supplied current value reaches the limit current value by comparing the limited current value thus obtained with the supply current value supplied to the driving means; A high speed type, comprising: a current cutoff means for outputting a current cutoff signal based on a current limit value detection signal output from the value detection means to cut off the current supplied to the drive means. Band of tightening force control device in flux machine.