JPH04152017A - High-speed cutter - Google Patents

Abstract

PURPOSE:To change the cut length of a tube without stopping a high-speed cutter by allowing the speed of a slider to follow the speed of the flat tube in the high-speed cutter of the flat tube used for a vehicle heat exchanger. CONSTITUTION:The torque of a pulse motor 30 driven at the required rotating speed in response to the cut length of a flat tube to be cut is transferred to a gear 47 constituting a shift system via the first cam disk 35, a cam shaft 40 and the second cam disk 37, it is further transferred to a rotary cutting blade 18 via the shift system, and it is transferred to a slider 12 via a crank system. The speed of the slider 12 is changed in a sine curve shape, pseudo follow segments approximate to the speed of the tube 1 are periodically generated, and the tube 1 is cut off by the cutting blade 18 in the segments. When the position of a bearing 39a supporting the cam shaft 40 is changed by a position adjusting means, the increase/decrease ratio between the motor 30 and the gear 47 is changed, and the tube 1 is cut off at the required length.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention is capable of sizing objects to be cut, particularly flat tubes used in heat exchangers for automobiles, such as radiators and condensers, at high speed and with high precision. This invention relates to an improvement of a high-speed cutting machine for cutting.

(American technology) First! A conventional high-speed cutting machine of this type shown in Fig. 15 and Fig. Is6 will be explained.

1 is a flat tube for a heat exchanger, which is an overlapping piece, and includes a tube making machine that shapes the strip tube material into a tube shape, a vertical roller that processes the tube into a flat shape, and a machine that applies solder plating to the tube surface. It is continuously supplied from a tube manufacturing device (not shown) consisting of a soldering furnace, a Cynon roller for removing distortion from the tube, and the like. A contact roller 2 is brought into contact with the supply side of the flat tube 1. The contact loaf 2 is connected to an analog-to-digital converter 3 that generates a pulse of one pulse each time the contact loaf 22 rotates by a certain angle.
The output pulses are input to the drive control means 4. This drive control means 4 has a built-in memory/arithmetic circuit that processes the output pulses of the analog-to-digital converter according to predetermined steps to generate control pulses. It can be driven at the required rotation speed depending on the cutting length.

A crank pongee 6 is directly connected to the shaft of the pulse motor 30, and a crank 7 and a gear 8 are fixed to the crank pongee 6. Further, a connecting rod 9 is attached to the crank 7 so that the amount of eccentricity can be adjusted by an eccentricity adjusting screw 10. The connecting rod 9 is for driving the sector gear 11. The second is a slider, which is slidably supported by two rails 13, and a rack 14 that meshes with the sector gear 11 is provided in a part of the warmer so that it can reciprocate as shown by arrows A and B. . Numeral 15 is a gear that forms a transmission mechanism in combination with the gear 8, and is connected to a spline shaft 17 via a screw gear 16.
Rotate. Reference numeral 18 denotes a rotary cutting blade for cutting the flat tube 1, which is attached to a spline shaft 17, and the spline shaft 17 is held on the second slider by a bearing 22. Reference numeral 19 denotes a cutting blade holder attached to the second slider, and the rotating cutting blade 18 is mounted on the holder 19.
As shown in Fig. 7, the cutting structure consisting of the 0-rotation cutting blade 18 and the female blade 20 is arranged such that the female blade 20 is sandwiched between the two. A protruding wedge-shaped cutting edge 18a is provided, and the female blade 20 is provided with a hole 20a into which the flat tube 1 is inserted.

Therefore, in this cutting W1 structure, the eccentricity of the connecting rod 9 can be adjusted by the eccentricity adjusting screw 10, and the second slider can be made to follow the flat tube 1 at the same speed. The center angle a of the cutting edge 18& of the rotary cutting blade 18 is selected so that the rotating cutting blade 18 rotates and cuts the flat tube 1 at the time when the flattened tube 1 follows the flattened chain 11. Note that 21 is a gamma id that guides the flat tube 1.

The conventional device has the above configuration, and the chain! When the flat tube 1 is supplied from the converter and starts moving to the left in FIG.
A pulse is generated at 13 and supplied to the drive control means 4.

In response to this, the drive control rate R4 performs arithmetic processing in the memory arithmetic circuit to generate a control pulse, which is supplied to the pulse motor 30 so that the erroneous pulse motor 30 can obtain the required cutting length. Drive is controlled by rotational speed. As a result, the crank 7 and gear 8, which are fixed to the crank transfer 6 directly connected to the pulse motor 30, rotate.
, rotation of the crank 7 causes a reciprocating movement in the connecting rod 9, and the sector gear 11 makes a swinging movement, so that the second slider makes a reciprocating movement as shown by arrows A and B. At this time, the speed of the second slider is As shown in Fig. 3, a pseudo-following section that changes like a sine white line and approximates the speed of the tube 1 occurs periodically.This amplitude can be adjusted by adjusting the crank eccentricity by operating the eccentricity adjusting screw 10. It can be changed by

On the other hand, due to the rotation of the single 8, the gear 15 that forms a transmission mechanism in combination with the gear 8 rotates, and the spline shaft 17 rotates via the screw gear 16. Then, during the forward step of the second slider, when the second slider follows the moving speed of the flat chip 1-11 at the same speed, the cutting blade 18 cuts the flat chip 1 all the way.

(Issues to be Solved by the Invention) However, in the above-mentioned high-speed cutting machine in the United States, when changing the cutting length, the tube manufacturing machine and the high-speed cutting machine are temporarily stopped, and the eccentricity adjusting screw 10 The amount of eccentricity of the crank must be adjusted by loosening the tube, which takes time to set up, resulting in a drop in equipment operation rate.Furthermore, in order to temporarily stop the tube manufacturing machine, it is necessary to adjust the amount of eccentricity of the crank. A certain tube was defective, which caused a problem in reducing the defective rate.

The present invention solves the above-mentioned interpolation point, makes it possible to change the cutting length without stopping the operation of the tube manufacturing machine and high-speed cutting machine, and improves the equipment operating rate and reduces the defective rate. The purpose is to provide high-speed cutting machines.

(! [Means for solving the problem) The present invention includes a contact roller that rotates in contact with a workpiece to be cut, and a contact roller that is connected to the contact roller and generates a number of pulses proportional to the moving speed of the workpiece. through an analog-to-digital converter that processes the pulses based on the cutting length of the object to be cut, a drive control means that drives the pulse motor at a rotation speed corresponding to the cutting length, a speed change mechanism, and a crank mechanism. A slider connected to the pulse motor and reciprocated along the object to be cut by the motor; and a rotary cutting blade attached to the blade and rotationally driven by the pulse motor via the speed change mechanism,
In a high-speed cutting machine in which the slider follows the workpiece at the same speed as the workpiece and the rotary cutting blade cuts the workpiece, the #! a first cam disk having one cam groove and rotatably driven by the pulse motor; a second cam having a second cam groove extending in the radial direction, rotatable and disposed concentrically with the first cam disk; A disk, a bearing mounted on a support shaft fixed between both cam disks so as to be movable along the radial direction of both cam disks, rotatable by this bearing and supported parallel to the rotation axis of both cam disks. a camshaft; a first eccentric cam follower fixed to one end of the camshaft and fitted in the first cam groove; a first eccentric cam follower fixed to the other end of the camshaft having an equal eccentricity and a phase difference of 180 degrees with respect to the cam follower; and a second eccentric cam follower that fits in the second cam groove, and a position adjustment means for variably adjusting the position of the bearing on the support shaft, and the transmission mechanism is configured on the rotation shaft of the second cam disc. It is characterized by one of the gears being fixed.

(Operations and Effects of the Invention) According to this configuration, the object to be cut can be cut! ! The torque of the pulse motor driven by the required rotation depending on the speed is the first
It is transmitted to the gears constituting the transmission mechanism via the cam disk, camshaft, and second cam disk, further transmitted to the rotary cutting blade via the transmission mechanism, and transmitted to the slider via the crank mechanism. As a result, the speed of the Sfib changes in a sine curve shape, and a pseudo-following section in which the speed of the slider approximates the speed of the object to be cut occurs synchronously.
In the same area, the object to be cut is cut by the rotating cutting blade.

According to the present invention, the increase/decrease ratio between the pulse motor and the gears forming the transmission mechanism can be variably adjusted by changing the position of the bearing that supports the camshaft using the position adjustment means. This allows the generation cycle of the pseudo-following section to be changed according to the cutting length of the object to be cut without stopping the cutting machine, which greatly improves the operating rate of the cutting machine and eliminates defective products. The incidence can be reduced.

(Example) A first example of the present invention will be described below based on FIGS. 1 and 2. Note that the same components as those of the conventional device described above are given the same numbers and will be briefly described.

A contact row 22 is placed in contact with the flat tube 1 on the flat tube 1-11 which is the object to be cut, and the contact a-22 is connected to the analog-to-digital converter 3. This analog-to-digital converter generates one pulse each time the contact roller 2 rotates by a certain angle, and supplies the generated pulse to the drive control means 4. The drive control means 4 incorporates a memory calculation circuit which is preset to process the pulses supplied from the analog-to-digital converter 3 and generate control pulses corresponding to different cutting lengths. is configured to be driven at a rotational speed corresponding to a predetermined cutting length.

The pulse motor 30 is fixed to the lower surface of the base 34 via a stay 31, a base 7 frame 32 fixed to the lower end of the stay 31, and a stay 33 fixed to the 7 frame 32.

A rotating shaft 35m of a first cam disk 35 is rotatably assembled to the base 7 frame 32, and the coaxial shaft 35a is connected to a rotating shaft 30a of a pulse motor 30 via a coupling 36. A first cam groove 35b extending in the radial direction is formed in the eleventh cam disk 35.

The base 34 has a rotating shaft 3'll of the second cam disk 37.
is rotatably assembled, and a gear 47 is fixed to the coaxial shaft 37&. A second cam groove 37b extending in the radial direction is formed in the 21st J mud disk.

A support shaft 38 extending across the space between the first cam disk 35 and the second cam disk 37 is fixed to the stay 31, and a bearing case 39 is attached to the same shaft 38.
The case 39 is assembled so as to be movable in the radial direction of the case 37.
The camshaft 40 is rotatable on a bearing 39a installed inside the shaft, or the rotating shaft 35a of the cam discs 35, 37,
It is attached parallel to 37a. This camshaft 4
The lower end of the shaft 40 is eccentric to the shaft 40 and the first
A first eccentric cam follower that fits into the cam groove 35b is fixed. Further, a second cam follower 42 is fixed to the upper end of the camshaft 40 and has an eccentric amount equal to the first eccentric cam follower and a phase difference of 180 degrees, and is fitted into the second cam groove.

Further, a housing 44 which rotatably holds a nut member 43 is fixed to the stay 31, and a setup pulse motor 45 for rotationally driving the nut member 43 is fixed to the housing 44.
is permanently installed.

On the other hand, one end of the screw pongee 46 is attached to the bearing case 39.
i! The other layer of the coaxial 46 is screwed into the nut member 43.

Gear 4 fixed to rotating shaft 37a of second cam disc 37
A gear 48 meshes with the gear 7, a gear 15 meshes with the gear 48, and the gear 15 meshes with a threaded gear 16 attached to one end of the thin spline 17. The spline thin 17 is rotatably attached to the second slider by a bearing 22, and a rotary cutting blade 18 is fixed to the other layer. The second Sfib is based on the base 34 by two rails 13.13.
It is slidably attached to the snow surface, and the connected arad 9 1
! A female blade 2 is carved with a rack 14 that fits together with the sector gear 11 connected to the end, and a rotary cutting blade 18 is sandwiched on the top surface.
A cutting blade holder 19 having a diameter of 0 is fixed.

Further, the crank wheel 6 is directly connected to the rotating shaft of the gear 8 that meshes with the gear 47, and the connecting rod 9 is connected to the crank 7 that rotates together with the crankshaft 6.

Note that 21 is a void plate that guides the flat tube 1.

The present embodiment has the above configuration, and its operation will be explained next.

Flat tube 1 is supplied from the tube manufacturing machine, #11
When the movement starts to the left in the figure, the contact roller 2 in contact with the flat tube 1 rotates, and accordingly, a pulse is generated in the analog-to-digital converter 3 and is supplied to the drive unit control means 4. . In response to this, the drive control means 4 performs arithmetic processing using a storage and arithmetic circuit to generate control pulses, which are supplied to the pulse motor 30 so that the pulse motor 30 can obtain the required cutting length. Drive is controlled by rotational speed.

When the 177th mud disk 35 is rotationally driven by the pulse motor 30, the camshaft 40 rotates, and further $2
The cam disc 37 rotates, and the gear 47 rotates together with the cam disc 37. As the II wheel 47 rotates, the crank 7 rotates, and the connecting rod 9 reciprocates to rotate the sector gear 1.
1 swings, so Sfib 2 moves along rail 13.13 as shown by arrow A.

It moves back and forth as shown in B.

As shown in FIG. 3, the second speed of the slider changes in a sine curve shape, and a pseudo-following section in which the speed of the slider approximates the speed of the tube periodically occurs.

On the other hand, the torque of the pulse motor 30 is gear 48, gear ]5
, is transmitted to the spline shaft 17 via the screw teeth $16, so the spline shaft 17 rotates and the tube 1 is cut to a required length by the rotary cutting blade 18 in the pseudo-following section.

Therefore, in the apparatus of this embodiment, in order to change the cutting length of the flat tube 1, the number of revolutions of the pulse motor 30 is changed, thereby changing the time interval between each cutting. At the same time, the setup pulse motor 45 is driven to rotate the nut member 43 by a predetermined amount. As a result, the threaded thread 46 moves along the threaded hole of the nut member 43, so the bearing case 39 moves along the support shaft 38 and stops at a predetermined position. As a result, the positions of the two cam disks 35, 37 of the camshaft 40 relative to the rotating shafts 35m, 37ai are changed. As a result, both cam discs 35.37
The increase/decrease ratio for each rotation of the rotating shafts 35a, 37a changes. The combination of these two movements causes the rotary cutting blade 18
When rotating to cut the flat tube 1, it is possible to make the second speed of the slider follow the speed of the flat tube 1, so the cutting length of the tube 1 can be changed while following the cutting.

In this way, according to this embodiment, the flat tube can be cut by changing the rotational speed of the pulse motor 30 without stopping the cutting machine and by adjusting the position of the bearing case 39 using the setup pulse motor 45. Since the cutting length of 1 can be changed, the operating rate of the cutting machine can be greatly improved and the incidence of defective products can be reduced.

By the way, 1. In the first embodiment, one end of the connecting rod 9 was connected to the sector gear 11 that meshes with the rack 14 provided on the second slider, but as in the vi2 embodiment shown in FIG. It is also possible to connect them.

In addition, in the $2 embodiment, except for the fact that teeth $49, 50, and 51 are interposed between @$47 and tooth 418, the other configurations are the same as in the first embodiment, so the same components are used. are given the same reference numerals and their explanations will be omitted.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a high-speed cutting machine according to a first embodiment of the present invention, FIG. 2 is a partially cutaway front view of the cutting machine, and FIG. 3 is a graph showing speed characteristics of a slider and a tube. Fig. 4 is a plan view of a high-speed cutting machine according to another embodiment of the present invention, Fig. 5 is a plan view of a conventional high-speed cutting machine, Fig. 6 is a front view of the cutting machine, and Fig. 7 is a rotary cutting machine. It is an enlarged view showing a blade. Explanation of symbols 1...Flat tube, 2...Contact roller, 3
... Analog-to-digital converter, 4... Drive control means, 6... Crankshaft, 7-... Crank, 8...
Gear, 9... Connecting rod, 2nd... Slider, 15
...Gear, 16...Screw gear, 17...Spline shaft, 18...Rotary cutting blade, 30...-Pulse motor, 35...1st cam disc, 35b...1st fJ
groove, 37...second cam disk, 37b...second
Cam groove, 38... Support shaft, 39... Bearing case, 39a... Bearing, 40... Camshaft, 41... First cam follower, 42... Second cam follower. 43... Nut member, 45... Pulse motor for setup, 46... Screw shaft, 47... Gear.

Claims (1)

[Claims] A contact roller that rotates in frictional contact with the object to be cut.
an analog-to-digital converter connected to the contact roller and generating a number of pulses proportional to the moving speed of the object to be cut; and an analog-to-digital converter that is connected to the contact roller and generates a number of pulses proportional to the moving speed of the object to be cut; a drive control means for driving a pulse motor at a rotational speed; a slider connected to the pulse motor via a speed change mechanism and a crank mechanism and reciprocated along the object to be cut by the motor; and a slider attached to the slider and connected to the pulse motor. and a rotary cutting blade rotationally driven by the speed change mechanism, the slider follows the workpiece at the same speed as the workpiece, and the rotary cutting blade cuts the workpiece. a first cam disk having an extending first cam groove and rotationally driven by the pulse motor; a second cam disk having a second radially extending cam groove, rotatable and disposed concentrically with the first cam disk; A cam disk, a bearing mounted on a support shaft fixed between both cam disks so as to be movable along the radial direction of both cam disks, rotatable by this bearing and supported parallel to the rotating wheel center of both said cam disks. a camshaft fixed to one end of the camshaft and fitted into the first cam groove; a first eccentric cam follower fixed to the other end of the camshaft and having an equal eccentricity and a phase difference of 180 degrees with respect to the cam follower; A second eccentric cam follower that fits into a second cam groove and a position adjustment means for variably adjusting the position of the bearing on the support shaft are provided, and a gear forming the transmission mechanism is provided on the rotation shaft of the second cam disc. A high-speed cutting machine characterized in that one of the following is fixed.