JPH10236683A - Feed roller and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To transport sheet-shaped objects such as recording sheets of paper with high precision. SOLUTION: A plurality of right-hand helical grooves 3a and left-hand helical grooves 3b are cut at the periphery of a roller shaft part 1, and a pyramidal projection 4 with sharp apex is formed in the part surrounded by the right-hand helical grooves 3a and left-hand helical grooves 3b. Each sheet transported is precluded from slippage by the action of the projection tip biting into the sheet, and the feeding accuracy of the sheet is enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a feed roller for feeding a sheet such as a recording sheet, and a method for manufacturing the same.

[0002]

2. Description of the Related Art As shown in FIG. 5, a plurality of recording papers A placed on a paper supply unit 30 are taken out one by one from above by a paper supply roller 31 and sent to a recording unit 32. In a color printer in which an ink sheet 34 having three color ink layers is heated by a provided recording head 33 and printing is performed on recording paper A by transferring molten ink or attaching sublimated ink, a paper feeding unit 30 is provided. The recording paper A sent from the printer is gripped by a feed roller 35 and a rubber roller 36 shown in FIG. 6, and the recording paper A is reciprocated three times with respect to the ink sheet 34 by forward and reverse rotation of the rollers 35 and 36. The color image is formed by sequentially printing color inks of yellow, magenta, and cyan for each feeding.

After a color image is formed, the recording paper A is sent from a paper discharge path 37 to a recording paper storage section 38.

In a color printer, as described above, since a yellow, magenta, and cyan ink are sequentially superposed to form a color image, a recording paper A and a feed roller 35 are formed.
When the feeding amount of the recording paper A becomes non-uniform due to slippage, color misregistration occurs and a clear color image cannot be obtained.

Therefore, the feed roller 35 is driven by the recording paper A
Is required to be able to send high precision.

As the feed roller 35, FIG.
The one shown in (II) is conventionally known. The feed roller 35 has a large number of protrusions 39 formed uniformly on its outer periphery. Here, the protrusion 39 is formed by etching, and the diameter is reduced toward the tip.

[0007]

In the feed roller 35, since the roller itself cannot be etched, the belt-shaped stainless steel plate 40 is etched to form the protrusion 39, and the stainless steel plate is formed. 40 is spirally wound around the outer periphery of the roller body 41,
The side edges that abut against each other are welded to form a roll, and the roll-shaped stainless plate 40 and the roller body 41 are fixed by bonding. In addition, since the projections 39 are soft and easily worn, the heat treatment such as quenching is performed to increase the hardness, and there is a problem that the production is very troublesome and the production cost is high.

Further, since the projection 39 is formed by etching, the tip of the projection 39 cannot be sharpened, and the grip force when the recording paper A is held between the rubber roller and the recording paper A is reduced by the cylindrical outer surface. Although it is stronger than the feed roller that holds the recording paper, it is not enough, and there is still a point to be improved in feeding the recording paper with high accuracy.

An object of the present invention is to provide a feed roller capable of feeding a sheet-like material such as recording paper with extremely high accuracy and a method of manufacturing the same.

[0010]

In order to solve the above problems, in the invention relating to the feed roller, a quadrangular pyramid projection formed by cutting is provided on the outer periphery of the roller shaft in the circumferential direction of the roller shaft. Also, a configuration in which a large number are provided at required intervals in the axial direction is adopted.

In another aspect of the invention relating to a feed roller, a plurality of right-handed grooves having a trapezoidal cross-sectional shape on the outer periphery of the roller shaft portion, and a plurality of left-handed grooves inclined at the same angle as the right-handed grooves. Are formed by cutting, and a configuration in which a quadrangular pyramid projection is provided in a portion surrounded by each groove is adopted.

Further, in the invention according to the method of manufacturing a feed roller, V-grooves extending to both end surfaces in the circumferential direction of the cylindrical outer surface are formed at required intervals, and the ridge formed between adjacent V-grooves. And a pair of circular cutters having the V-groove and the outer peripheral edge of one end face as cutting blades arranged at a predetermined interval in a circumferential direction on an outer peripheral surface of a work composed of a round shaft held by a chuck. The cutter is rotatably supported, and the center of rotation of each cutter is inclined at the same angle in the same direction with respect to a first plane that includes the axis of the work and is orthogonal to the feed direction in which the cutter cuts the outer periphery of the work. With respect to the second plane orthogonal to the one plane, the cutter is inclined in the same angle opposite direction, the cutter is fed in the radial direction of the work to adjust the cutting amount, and the work is rotated.
The work and the pair of cutters are relatively moved in the axial direction of the work, and the outer periphery of the work is cut by the pair of cutters rotated by contact with the work.

As described above, the provision of the quadrangular pyramid projection on the outer periphery of the roller shaft portion makes the tip of the projection sharp, so that the gripping force when clamping the sheet-like material with the rubber roller is extremely strong. The object can be transported with extremely high precision.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

As shown in FIG. 1, large-diameter shaft portions 2 are formed at both ends of the roller shaft portion 1. A plurality of right-handed grooves 3a are formed on the outer peripheral surface of the large-diameter shaft portion 2 and the right-handed grooves 3a. A plurality of left-handed grooves 3b inclined at the same angle as the grooves 3a are formed at equal pitches.

Each of the right twist groove 3a and the left twist groove 3b is formed by cutting, and has a trapezoidal cross section. In the embodiment, the right twist groove 3a and the left twist groove 3b have different groove depths, but may have the same depth.

Due to the formation of the right twist groove 3a and the left twist groove 3b, a projection 4 is formed on an inner portion surrounded by the respective twist grooves 3a, 3b. The projection 4 has a quadrangular pyramid shape and a sharp tip. The shape of the bottom surface of the projection 4 is arbitrary. The shape of the bottom surface is determined by the torsion angles of the right and left helix grooves 3a and 3b. When the helix angle is 30 °, a rhombus is formed. When the helix angle is 45 °, each of the four angles is 90 °.
Form a rhombus.

The projections 4 are arranged at equal pitches on the shaft of the roller shaft 1 and also at equal pitches in the circumferential direction. The row of the protrusions 4 arranged in the circumferential direction is shifted from the row of the adjacent protrusions 4 by a half pitch in the circumferential direction.

The size and pitch of the projections 4 are arbitrary, and in the embodiment, the height is 70 to 80 μm.
And the pitch P of the projections 4 aligned in the twisting direction of the right twist groove 3a or the left twist groove 3b is set to 45 degrees.
°, it is about 300 μm.

When the feed roller having the above-described configuration is used as, for example, a feed roller 35 of a color printer shown in FIG. 5, the feed roller has a large number of quadrangular pyramid projections 4 at both ends. Can reliably nip (grip) the recording paper A, and the protrusions 4 are formed at equal pitches in the circumferential direction and the axial direction. The projections 4 are sequentially fitted to feed the recording paper.

Therefore, when the recording paper A is conveyed by the rotation of the feed roller, there is no inconvenience that a slip occurs between the feed roller and the recording paper A, and the recording paper A is conveyed with extremely high precision. Can be.

FIGS. 2 to 4 show a cutting device for the feed roller. This cutting device has a chuck 10 for holding a shaft-shaped work W, and a tool rest 11 movably supported by the chuck 10.

A shank 13 of a cutter holder 12 is removably attached to the tool rest 11 through means by tightening a set screw 14. The cutter head 15 provided at the tip of the cutter holder 12 has two roller shafts 16a,
A cutter 16a is provided, and cutters 17a, 17b are rotatably supported on the respective roller shafts 16a, 16b.

The cutters 17a and 17b have a circular shape, and V-grooves 18 extending to both end surfaces are formed at regular intervals in the circumferential direction of the outer peripheral surface, and a ridge 19 is provided between the adjacent V-grooves 18. The ridgeline of the V-groove 18 and the ridge 19 and the outer peripheral edge of one end face are formed as cutting edges 20.

The roller shafts 16a and 16b for rotatably supporting the cutters 17a and 17b are inclined in two directions. Here, the inclination in two directions refers to an inclination with respect to a plane parallel to a horizontal plane including the axis of the work W, and an inclination with respect to a plane parallel to the vertical plane including the axis.
The two roller shafts 16a and 16b are inclined in the same direction with respect to a plane parallel to the horizontal plane, and are inclined at the same angle opposite to the plane parallel to the vertical plane.

The chuck 1 of the cutting device having the above configuration
0, the workpiece W is pinched and rotated in one direction at a high speed.
By adjusting the cutting depth of 7a, 17b and feeding the work W in the axial direction, the cutters 17a, 17b rotate by contact with the work W, and cut the outer periphery of the work W.

At this time, since the cutters 17a and 17b are inclined in opposite directions to a plane parallel to a vertical plane including the axis of the work W, the outer periphery of the work W is twisted rightward by one of the cutters 17a. A plurality of grooves 3a are formed, and a plurality of left twist grooves 3b are formed by the other cutter 17b. A quadrangular pyramid projection 4 is formed in a portion surrounded by the twist grooves 3a and 3b.

Here, if the V-groove 18 provided in the cutters 17a, 17b is parallel to the axis of the cutters 17a, 17b, the mounting angle of the cutters 17a, 17b (the roller shaft 16)
a, 16b), the rotation speed of the work W, and the feed amount of the work W, the projection 4 has a rhombic quadrangular pyramid in plan view.

The V-groove 18 is inclined at an angle of 15 ° with respect to the axis of the cutters 17a and 17b, and the V-groove 18 formed on one cutter 17a and the V-groove 18 formed on the other cutter 17b. Is opposite, the projection 4 has a rhombic quadrangular pyramid whose planar shape is 90 ° at each angle.

Since the projections 4 are formed by cutting,
The projections 4 having sharp points at the front end and the ridge line are formed, and the sheet 4 such as the recording paper A can be eaten very well.

Further, since the shaping is performed by cutting, by using a hard material as the shaft-shaped work W, the feed roller can be used in a cut state, and heat treatment after cutting can be unnecessary.

[0032]

As described above, according to the present invention, since a large number of square pyramid projections with sharp tips are formed on the outer peripheral surface of the roller shaft portion, the tips of the projections at the time of feeding a sheet-like material such as recording paper. Bites into the sheet-like material, and the sheet-like material can be sent with extremely high precision.

Further, since the projections are formed by cutting, it is easy to manufacture and it is possible to provide a low-cost feed roller.

Further, by forming the quadrangular pyramid projections by cutting the right twist groove and the left twist groove, these projections are arranged at equal pitches in the axial direction and the circumferential direction of the roller shaft portion, and the like. At the time of feeding, each projection is sequentially fitted into the wound of the previously formed projection to feed the sheet, so that the sheet can be transported with higher precision.

[Brief description of the drawings]

FIG. 1 (I) is a perspective view showing an embodiment of a feed roller according to the present invention, (II) is an enlarged perspective view showing a part of the same, and (III) is a developed view of (II).

FIG. 2 is a cross-sectional view illustrating a feed roller cutting device according to the first embodiment;

FIG. 3 is a sectional view taken along line aa of FIG. 2;

FIG. 4 is an enlarged sectional view showing a cutting state of the above.

FIG. 5 is a schematic diagram of a color printer.

FIG. 6 is a perspective view showing a feed roller of the above.

FIG. 7I is a sectional view showing a conventional feed roller,
I) is a development view

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Roller shaft part 3a Right twist groove 3b Left twist groove 4 Projection 10 Chuck 17a, 17b Cutter 18 V groove 19 Ridge 20 Cutting edge

Claims (3)

[Claims] 1. A feed roller in which a large number of quadrangular pyramid projections formed by cutting are provided on an outer periphery of a roller shaft portion at predetermined intervals in a circumferential direction and an axial direction of the roller shaft portion. 2. A plurality of right-handed grooves having a trapezoidal cross section and a plurality of left-handed grooves inclined at the same angle as the right-handed groove are formed on the outer periphery of the roller shaft portion by cutting. Feed roller with square pyramid projections in the area surrounded by. 3. V-grooves extending to both end surfaces in the circumferential direction of the cylindrical outer surface are formed at predetermined intervals, and a ridge formed between adjacent V-grooves, a ridge line of the ridge of the V-groove and A pair of circular cutters each having an outer peripheral edge at one end face as a cutting edge are arranged at a required interval in a circumferential direction on an outer peripheral surface of a work composed of a round shaft held by a chuck to rotatably support each cutter. A first rotation center of the cutter, which includes the axis of the work and is orthogonal to a feed direction in which the cutter cuts the outer periphery of the work.
The cutter is inclined at the same angle to the plane in the same direction and at the same angle to the second plane orthogonal to the first plane in the opposite direction to each other. A feed roller that moves the work and a pair of cutters relatively in the axial direction of the work while the work is rotated, and cuts the outer periphery of the work by the pair of cutters that rotate by contact with the work. Manufacturing method.