JPS58144055A - Wire feeding device - Google Patents

Abstract

PURPOSE:To provide possiblity of feeding a wire surely straight in the axial direction by permitting a cover, mounted on a holding member with possiblity of relative movement, to press a retainer, putting the roller in pressure contact with the wire, and thereby maintaining the shaft of roller in a desired position of tilting. CONSTITUTION:The body 1 of this arrangement 1 is equipped with a holding member 2, hollow shafts 6, 7 installed projectingly at the inlet and outlet for wires, etc. where the holding member 2 is mounted on hollow shaft 9 of a motor with the aid of a cramp 8 provided at the end of said hollow shaft 6. At this time, the square drum part 5 between two flanges 3, 4 is excavated with hole 13 in the direction perpendicular to the axis 12 of wire, and retainers 14a, 14b are set in this hole slidably to bear the shafts 16 of rollers 15 with their both ends. A cover is installed, and the internal surfaces of its cylindrical part 26 are fitted at the flanges 3, 4 rotatably while the sleeve part 27 is fitted on the hollow shaft 7 also rotatably. The roller 15 is put in pressure contact with the wire by permitting the cover 25 to press the retainer 14 so as to ensure straight feeding of the wire.

Description

[Detailed description of the invention] This estrus involves a device that feeds the wire axially.

The device for feeding electrode wires or filler metal wires (hereinafter simply referred to as wires) for gas-shielded arc welding to the user side of a torch, etc. is a device that is installed inside a holder that is detachably attached to the end of the hollow shaft of a motor. A wire feeding device is known which includes a plurality of rollers arranged at an angle with respect to the axis of the wire and pressed against the wire. However, in conventional wire feeding devices, the roller is supported by a cantilevered shaft, or the roller is supported by a double-sided roller, with separate actuating pieces acting on both ends of the support shaft to press the roller against the wire. There are many cases where the spindle deviates from the intended tilted position due to deflection of the spindle, uneven movement of the actuating piece, or local deformation, especially when using hard wires with large pressure welding forces. The inclination angle of the roller changes, and the wire no longer moves straight in the axial direction, often causing excessive friction with the wire guide.

The present invention has been made in view of the above points, and an object thereof is to provide a wire feeding device in which the spindle of the roller is maintained at a predetermined inclined position and the wire is fed so as to reliably move straight in the axial direction. That is.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

In the figure, 1 is a wire feeding device, and 2 is a holder, which is provided with notched disc-shaped collars 3 and 4, a square body 5 between these collars, and a protruding part on the collar 3 on the wire inlet side. a hollow shaft 6,
It consists of a hollow shaft 7 protruding from a collar 4 on the wire exit side. Reference numeral 8 denotes a collet chuck type fastener provided at the end of the hollow shaft 6, and the holder 2 uses this fastener to tighten the hollow shaft 9 of the motor.
It can be detachably attached to the 10 is a wire entry guide screwed into the flange portion 3, and 11 is a wire exit guide screwed into the collar portion 4, both of which have a bush shape. A hole 13 is formed through the square body 5 in a direction perpendicular to the axis 12 of the wire passing through the center of the inlet guide IO and the outlet guide 11, and piston-shaped holders 14a and 14b are inserted into this hole.
is slidably fitted. A roller 15a formed by suitably processing the outer ring of a ball bearing is housed in the holder 14a with a portion of the roller 15a protruding from the inner end of the holder 14a.
It is rotatably supported by a double-supported support shaft 16a.

The head (outer end) 17a of the holder 14a has a spherical shape. 18a is a round key, which is removably inserted into one of the two grooves 19a provided on the outer peripheral wall of 113 and a groove 20a provided on the outer peripheral part of the holder 14a. The 14b side also has the same configuration as the holder 14a side, and the corresponding part is shown with b attached instead of a. As shown in FIG.
Both ends are inserted into seat holes 22a and 22b drilled at 4am and 14b. 25 is a cover whose cylindrical part 2
The inner surface of the holder 6 is fitted into the collar parts 3 and 4 of the holding body, and the sleeve part 27 thereof is fitted into the hollow shaft 7, respectively, so as to be freely rotatable.

Reference numeral 28 denotes an eccentric cam formed inside the cylindrical portion 26, whose inner surface 29 has an elliptical cylindrical shape, and the heads 17& and 17b of each holder abut on this inner surface 29. Reference numeral 30 denotes a disc-shaped bevel gear fixed to the end plate 81 of the cover 25, while a similar bevel gear 32 opposite thereto is fixed to the collar 4 of the holder. Reference numeral 33 denotes a hole for inserting a handle 34, which is bored in the cylindrical portion 26 of the cover. The handle 34 has a T-shape,
A small bevel gear 35 is fixed to the tip.

In the device configured as described above, the pressure force of the roller against the wire can be adjusted by rotating the cover 25 around the holder 2 with the wire W passed through the holder 2, and rotating the inner surface 29 of the eccentric cam of the cover at each position. This is done by pressing the heads 17a and 17b of the holder, and inserting the handle 34 through the hole 33, engaging the bevel gears 30 and 32, and tightening. Each roller is supported by support shafts 16a and 16b that are supported on both sides, and integral holders 14B and 14b that hold both ends of the support shafts are connected to each other with a small gap between the holes.
3, the support shafts 16a and 16b do not shift from the desired tilted position even if the roller pressure force is increased by tightening the eccentric cam 28, and the rotation of the hollow shaft 9 of the motor is reliably sent straight in the axial direction.

Also, if you want to change the wire feeding speed, that is, the wire feeding distance per rotation of the holder 2, remove the round keys 18a and 18b and reset them so that they are engaged with the other grooves 19a and 19b. , holders 14a and 1
What is necessary is to change the setting angle of 4b to the holder 2.

Note that a plurality of grooves in which the round keys 18a and 18b engage may be provided on the holder side, and
If the outer periphery of the hole 13 is formed into a spline shaft shape, and a spline groove is provided on the inner surface of the hole 13 to fit the spline groove, the wire feeding speed can be adjusted more finely. This is extremely convenient when it is desired to provide a small difference in feeding speed between the feeding side and the drawing side in two wire feeding devices provided at both ends. Of course, if the wire feeding speed can always be constant, only one groove may be provided in the hole 18, and the holder 14& and 14t) may be formed into a polygonal column shape or the like.

In the above embodiment, since the bevel gears 8o and 32 are provided and tightened by the handle 34, the pressure welding force of the wire can be adjusted with a small operating force. Alternatively, the cover may be rotated one rotation by inserting a rod or by using a torque wrench or the like.

FIG. 5 shows another embodiment of the present invention, in which a cover 50 is formed with a conical inner surface 51 whose central axis is the axis 12 of the wire, and the inner surface 51 of the hollow shaft 52 of the cover 50 and the wire of the holder 2 are formed. This embodiment differs from the previous embodiment only in that a threaded portion is formed on the outer surface of the hollow shaft 53 on the outlet side to screw them together, the bevel gears 30 and 82 are eliminated, and a ring-shaped weight 54 is attached to the cover 50. Other identical or equivalent parts are given the same reference numerals as in the previous embodiment. Note that the above-mentioned conical surface includes not only one whose generating line is a straight line but also one whose generating line is a curved line.

In this embodiment, the roller support shafts 16a, 16b can be held in the desired positions similar to the previous embodiment, and furthermore, in this embodiment, the rollers are automatically pressed against the wire and released from the pressure contact. It is now possible to perform That is, the rollers 15B and 15b are pressed against the wire by rapidly rotating the holding body 2 by starting the motor, and the cover '50 is rotated relative to the holding body 2 due to the inertial force of the weight 54 and others. It takes advantage of the fact that it is fed in the direction of arrow X. The weight 54 is replaced depending on the material of the wire, etc. By applying an appropriate deceleration using an electromagnetic brake or the like when the motor is still stopped, it is possible to release the roller pressure contact by an operation opposite to the above.

In this embodiment, it is also possible to manually press and release the roller from the wire; in this case, the weight 54 may be omitted and the hollow shaft 52 of the cover may be rotated using a wrench or the like. Further, the cover 50 is not screwed onto the hollow shaft 58, but is simply fitted onto the holder 2 so as to be movable in the wire axial direction, and the nut screwed onto the hollow shaft 53 is tightened to tighten the holder 2 of the cover 5'6. It may also be possible to perform relative movement to.

The present invention is not limited to the above-described embodiments; for example, the number of rollers may be eight or more, and a plurality of sets of rollers may be arranged in the holder in the wire axial direction. Further, if the wire has high rigidity, the contact points of the opposing rollers with the wire may be shifted.

Like I explained above? According to the present invention, a holder for holding both ends of the spindle of the roller is fitted into the holder so as to be able to move toward and away from the wire, and the holder is attached to the holder by the inclined surface of the cover that is movably attached to the holder. Since the roller is pressed against the wire by pressing the roller, even if the pressing force of the roller against the wire is increased, the spindle of the roller is maintained at the desired inclined position, and the wire is ensured to move straight in the axial direction. will be sent.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a wire feeding device showing an embodiment of the present invention, FIG. 2 is a partially cutaway plan view, FIG. The figures are the same cross-sectional view taken along line B--B, and FIG. 5 is a view corresponding to FIG. 1 showing another embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Wire feeding device, 2... Holding body, 12...
Axis of wire, 13... Hole, 14a, 14b... Holder, 15 a, 15 b/o-ra, 16a116
b--Spindle, 17a, 17b--Head, 18a,
l 8 b.:i,, key, 19a, 19b...groove, 20a, 20b-...groove, 25...cover, 28.
...Eccentric cam, 29...Inner surface, 50...Cover, 5
1...Inner surface, 52...Hollow shaft, 53...Hollow shaft. 3rd eye 1″1A Figure 4 M

Claims (1)

[Claims] 1. A plurality of rollers arranged at an angle with respect to the axis of the wire in a holder detachably attached to the end of the hollow shaft of the motor, and the rollers are pressed against the wire. In a wire feeding device equipped with a press-contact mechanism, a holder for holding both ends of the spindle of the roller is fitted into the holder so as to be able to move toward and away from the wire, and the head of the holder is inclined so as to come into contact with the wire. A wire feeding device characterized in that the press-contact mechanism is constructed by attaching a cover having a surface to the holder so as to be relatively movable. 2. The wire feeding device according to claim 1, wherein the angle of the holder relative to the holder is variable. 6. The wire feeding device according to claim 1 or 2, wherein the inclined surface is an inner surface of an eccentric cam centered on the axis of the wire formed inside the cover. 4. The wire feeding device according to claim 1 or 2, wherein the inclined surface is a conical surface formed inside the cover and whose central axis is the axis of the wire. 5. The wire feeding device according to claim 4, wherein the cover is screwed onto the holder so as to be rotatable around the wire axis.