JP2017100876A - Pinch roller fixation mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pinch roller fixation mechanism which can reliably fix a pinch roller to a square shaft.SOLUTION: A fixation mechanism for a pinch roller which transports a medium which the pinch roller holds together with a drive roller, and which is fixed to a shaft member which is extended in an X-axis direction and has a substantially rectangular cross-sectional shape has: a fitting member equipped with a recess which can accommodate the shaft member, and which includes a first contact surface which can contact a first face extending in the X-axis direction of the shaft member, and a second contact surface which is adjacent to the first face and can contact a second face extending in the X-axis direction of the shaft member; and fitting means including a third contact surface which faces the first face and which contacts a third face extending in the X-axis direction of the shaft member. The fitting means is movable in a Y-axis direction and is fixed at an optional position within a movable range in the Y-axis direction, and a length of an area thereof contacting the third face in a Z-axis direction is so made as to be 1/3 or more of a width of the shaft member in the Z-axis direction.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a pinch roller fixing mechanism, and more particularly to a fixing mechanism for holding a medium together with a drive roller and fixing a pinch roller for conveying the pinched medium to a shaft.

  2. Description of the Related Art Conventionally, a processing apparatus that performs predetermined processing such as printing or cutting on a medium by a head that conveys the medium in a predetermined direction and moves in a direction orthogonal to the predetermined direction is known.

  Such a processing apparatus includes a media transport mechanism for transporting media.

  In this media transport mechanism, as shown in FIG. 1, a drive roller 204 disposed on a platen 202, and a roll 206 elastically contacts the drive roller 204 and the roll 206 rotates as the drive roller 204 rotates. The roller 200 is provided, and a plurality of combinations of the driving roller 204 and the pinch roller 200 are arranged along the width direction of the medium (that is, the direction orthogonal to the conveyance direction of the medium).

The medium is conveyed in a predetermined direction by driving the driving roller 204 in a state where the medium is sandwiched between the driving roller 204 and the pinch roller 200.

  Here, each pinch roller 200 is extended in the width direction of the medium, and the platen 202 is opposed to a square shaft 208 having a substantially rectangular cross section disposed in parallel with the platen 202 on which the driving roller 204 is disposed. It is arranged at a position corresponding to the driving roller 204 arranged in.

  Such a pinch roller 200 is provided with an attachment member 210 for attachment to the square shaft 208, and the square shaft 208 is formed in a space formed by a recess 212 and a sheet metal 214 formed in a substantially U-shaped cross section. The pinch roller 200 is attached to the square shaft 208 by being inserted.

At this time, the space formed by the recess 212 and the sheet metal 214 of the mounting member 210 is formed slightly larger than the square shaft 208 so that the mounting member 210 can be easily inserted into the square shaft 208. For this reason, the pinch roller 200 is disposed with play with respect to the square shaft 208.
However, as in the conventional technique described above, when the pinch roller is arranged with play with respect to the square shaft, the state of elastic contact with the driving roller by the pinch roller is released. The pinch roller can move freely to some extent.

  When pinch down is performed in a state where the alignment of each of the plurality of pinch rollers arranged is not complete (that is, the pinch roller is elastically contacted with the driving roller), the pinch roller inclined in the yaw direction or the roll direction is Occurs and the pinch rollers are not aligned properly when pinching down.

Such pinch roller alignment at the time of pinch down is eliminated by, for example, continuing to convey the media, but until it is eliminated, a feeding difference occurs in the media, the feeding accuracy decreases, and the media There were problems such as wrinkles.

  In order to solve these problems, it is conceivable to fix the pinch roller to the square shaft.

  That is, by adjusting the fixing position of the sheet metal mounting member during pinch-up, the square shaft is appropriately pressed against the concave portion through the bent portion of the sheet metal and fixed, so that each pinch roller is aligned. When the pinch is down, the pinch roller is already aligned.

  However, since the bent portion of the sheet metal is configured so that the pinch roller does not fall off from the square shaft, the contact area between the bent portion and the square shaft is small, and the square shaft cannot be properly pressed against the concave portion.

Therefore, the pinch roller cannot be securely fixed to the square shaft, and the alignment of each pinch roller cannot be adjusted at the time of pinch up.

For this reason, the proposal of the fixing mechanism of the pinch roller which can fix a pinch roller to a square shaft reliably was desired.

  Note that the prior art that the applicant of the present application knows at the time of filing a patent application is not an invention related to a known literature invention, and therefore there is no prior art document information to be described in the present specification.

  The present invention has been made in view of the above-described demands of the prior art, and an object of the present invention is to provide a pinch roller fixing mechanism that can securely fix the pinch roller to the square shaft. Is.

  In order to achieve the above object, the present invention has been made based on the following findings by the present inventors.

That is, the applicant of the present application has made various changes in the length in the vertical direction of the bent portion of the sheet metal for pressing the square shaft to the concave portion in the mounting member of the pinch roller, so that the square shaft is appropriately pressed into the concave portion. Has found that the length of the bent portion in the vertical direction must be 1/3 or more of the diameter of the square shaft.

  The present invention has been made on the basis of the above-mentioned knowledge by the inventor of the present application, and in order to appropriately press the square shaft against the concave portion in the mounting member of the pinch roller, the vertical length of the bent portion of the sheet metal is set to the square shaft. It is made to be 1/3 or more of the diameter.

As a result, the pinch roller can be securely fixed to the square shaft, and the pinch roller can be aligned at the time of pinch-up.

  That is, the present invention conveys the medium sandwiched with the drive roller and also has a substantially rectangular cross-section of the shaft member extending in the X-axis direction in the XYZ orthogonal coordinate system (the square shaft 100 in the section of the embodiment for carrying out the invention). In the fixing mechanism of the pinch roller fixed to the shaft member, the shaft member can be accommodated and the first contact that can contact the first surface extending in the X-axis direction of the shaft member can be accommodated. A mounting member comprising a contact surface and a recess provided with a second contact surface capable of contacting a second surface extending in the X-axis direction of the shaft member adjacent to the first surface; and the mounting member Mounting means comprising a third abutting surface that abuts on a third surface extending in the X-axis direction of the shaft member facing the first surface of the sheet member (the sheet metal in the section of the mode for carrying out the invention) The mounting means is movable in the Y-axis direction, is fixed at an arbitrary position within the movable range in the Y-axis direction, and is in contact with the third surface. The length of the contact area in the Z-axis direction is set to be 1/3 or more of the width of the shaft member in the Z-axis direction.

  Further, according to the present invention, in the above-described invention, the first contact surface and the second contact surface are each formed at two positions with a predetermined interval in the X-axis direction. The length in the X-axis direction of the region in contact with the surface 3 is made to coincide with the predetermined interval.

  Further, the present invention is the above-described invention, wherein the attachment means is composed of an insertion region extending in the Y-axis direction, and a bent region connected to one end of the insertion region and extending in the Z-axis direction. A sheet metal having a substantially L-shaped cross section, and a long hole extending in the Y-axis direction is formed by fitting a screwing member to be screwed into the shaft member into the insertion region. It is.

  Since this invention is comprised as demonstrated above, there exists the outstanding effect that a pinch roller can be reliably fixed with respect to a shaft member like a square shaft.

FIG. 1 is an explanatory view showing a pinch roller fixing mechanism according to the prior art. FIG. 2 is an explanatory perspective view of a schematic configuration of a pinch roller provided with a pinch roller fixing mechanism according to the present invention. 3 is a cross-sectional view taken along line AA in FIG. FIG. 4 is a rear exploded perspective view of the pinch roller shown in FIG.

Hereinafter, an example of an embodiment of a pinch roller fixing mechanism according to the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 2 is a perspective view schematically showing a configuration of a pinch roller having a pinch roller fixing mechanism according to the present invention, and FIG. 3 is a cross-sectional view taken along line AA of FIG. 4 is a rear exploded perspective view of the pinch roller shown in FIG.

  The pinch roller 10 shown in FIG. 2 is configured so that a plurality of drive rollers (not shown) are parallel to a platen (not shown) arranged in parallel along the X-axis direction of the XYZ orthogonal coordinate system. An attachment member 12 attached to a square shaft 100 extending in the axial direction is provided.

  A recess 14 into which the square shaft 100 can be fitted is formed on the rear side of the mounting member 12.

  In the recess 14, contact portions 16a and 16b that contact the lower surface 100a of the square shaft 100 are formed at both ends of the lower surface 14a, and contact portions that contact the front surface 100b of the square shaft 100 at both ends of the front surface 14b. 18a and 18b are formed.

  Moreover, the insertion part 22 in which the sheet metal 20 is inserted is formed in the upper surface 14c of the recessed part 14. As shown in FIG.

Here, the mounting member 12 is formed with a hole 40 reaching from the upper surface 12 a to the upper surface 14 c of the recess 14, and the sheet metal 20 inserted into the insertion portion 22 is inserted by a screw 24 inserted from the hole 40. It will be fixed to the part 22.

  The sheet metal 20 includes an insertion region 20a to be inserted into the insertion portion 22 formed on the upper surface 14c of the recess 14, and a bent region 20b formed by bending substantially perpendicular to the insertion region 20a on the rear side. Yes.

  The sheet metal 20 is inserted into the insertion portion 22 formed in the upper surface 14c of the recess 14 so that the insertion region 20a is bent downward, and a long hole 26a formed in the insertion region 20a, Screws 24 are inserted into 26b and fixed.

  Accordingly, the sheet metal 20 is fixed by inserting the screw 24 inserted from the hole 40 into the long holes 26a and 26b after inserting the insertion region 20a into the insertion part 22, but at this time, the long holes 26a and 26b are fixed. In the range of the length L2, it can be moved and fixed to the front side and the rear side.

  In addition, as a member which fixes the sheet metal 20 to the insertion part 22, what kind of member may be sufficient if it is a member which can be screwed to the long holes 26a and 26b and the attachment member 12, and can fix the sheet metal 20, for example, Bolts may be used.

The bent region 20b of the sheet metal 20 is a flat surface in which the entire front surface 20ba can come into contact with the square shaft 100, and the length L1 in the vertical direction (that is, the Z-axis direction) is the diameter d1 of the square shaft 100. It is more than 1/3 of the length. The length L3 in the left-right direction (that is, the axial direction) is equal to the length L4 from the right side end of the contact portion 16a to the left side end of the contact portion 16b. To do.

  The mounting member 12 is provided with a lever member 30 that can rotate about a support shaft 28 so as to protrude forward. A support shaft is provided in the vicinity of the front end of the lever member 30. A roll 34 that is rotatable about 32 is disposed.

In addition, the lever member 30 is constantly biased downward by the coil spring 36. Thus, when the square shaft 100 to which the pinch roller 10 is attached rotates in the direction of arrow B, the pinch roller 10 is moved to the arrow. Rotating in the C direction, the roll 34 comes into elastic contact with a driving roller (not shown) with a predetermined pressure.

  The case where the pinch roller 10 provided with the pinch roller fixing mechanism according to the present invention is fixed to the square shaft 100 in the above configuration will be described.

  First, the square shaft 100 is inserted into the recess 14 of the mounting member 12, and the pinch roller 10 is moved to a predetermined position corresponding to a drive roller (not shown).

  Next, the insertion region 20 a of the sheet metal 20 is inserted into the insertion portion 22, and the screws 24 inserted from the holes 40 are inserted into the long holes 26 a and 26 b to fix the sheet metal 20 to the mounting member 12.

  At this time, the front surface 20ba of the bent region 20b is brought into contact with the rear surface 100c of the square shaft 100, and the lower surface 100a of the square shaft 100 is pressed against the contact portions 16a and 16b by the bent region 20b. The sheet metal 20 is fixed by screws 24 at positions where they are pressed against 18a and 18b.

  Here, the length L1 in the Z-axis direction of the bent portion 20b that contacts the square shaft 100 in the sheet metal 20 is not less than 1/3 of the diameter d1 of the square shaft. , 16b, 18a, 18b.

  Thereby, the pinch roller 10 can be reliably fixed to the square shaft 100.

  Although the length L1 of the bent region 20b of the sheet metal 20 is set to 1/3 or more of the diameter of the square shaft 100, if the length L1 is shorter than this, the contact portion 16a, 16b, The present invention has experimentally confirmed that it may not be pressed against 18a, 18b.

That is, the inventor of the present application has repeatedly performed an experiment in which the length L1 of the bent region 20b is changed and the square shaft 100 is pressed against the contact portions 16a, 16b, 18a, and 18b of the concave portion 14, and as a result, the length L1 is It was confirmed that the pinch roller 10 was securely fixed to the square shaft 100 when the value was 1/3 or more of the diameter d1 of 100.

  As described above, the pinch roller 10 having the pinch roller fixing mechanism according to the present invention extends in the X-axis direction on the contact portions 16a, 16b, 18a, and 18b of the concave portion 14 of the mounting member 12. In order to reliably press the square shaft 100, the length L1 in the Z-axis direction of the bent region 20b that contacts the square shaft 100 in the sheet metal 20 inserted into the insertion portion 22 of the recess 14 is 1 of the diameter d1 of the square shaft 100. / 3 or more.

  Thereby, in the pinch roller 10 equipped with the pinch roller fixing mechanism according to the present invention, the square shaft 100 can be fixed while being securely pressed against the contact portions 16a, 16b, 18a, 18b. It can be fixed securely.

  Furthermore, in the pinch roller 10 provided with the pinch roller fixing mechanism according to the present invention, since many constituent members have the same configuration as the pinch roller according to the prior art, it can be manufactured without incurring high costs. it can.

  The present invention is suitable for use in a pinch roller that elastically contacts a drive roller in a media transport mechanism.

  10 Pinch roller, 12 Mounting member, 14 Recessed part, 16a, 16b, 18a, 18b Abutting part, 20 Sheet metal (mounting means), 100 Square shaft (shaft member)

Claims (3)

In the fixing mechanism of the pinch roller that conveys the media sandwiched with the driving roller and is fixed to the shaft member having a substantially rectangular cross section extending in the X-axis direction in the XYZ orthogonal coordinate system,
A shaft member can be accommodated, and a first contact surface capable of contacting a first surface extending in the X-axis direction of the shaft member and the shaft member adjacent to the first surface An attachment member having a recess provided with a second contact surface capable of contacting a second surface extending in the X-axis direction;
A mounting means having a third abutting surface that abuts a third surface extending in the X-axis direction of the shaft member facing the first surface of the mounting member;
The attachment means is movable in the Y-axis direction and is fixed at an arbitrary position in the movable range in the Y-axis direction, and the length in the Z-axis direction of the region in contact with the third surface is: It is 1/3 or more of the width | variety of the Z-axis direction of the said shaft member. The fixing mechanism of the pinch roller characterized by the above-mentioned. The pinch roller fixing mechanism according to claim 1,
Each of the first contact surface and the second contact surface is formed at two locations at a predetermined interval in the X-axis direction,
The pinch roller fixing mechanism, wherein a length of the region in contact with the third surface of the sheet metal in the X-axis direction coincides with the predetermined interval. In the fixing mechanism of the pinch roller according to any one of claims 1 and 2,
The attachment means is a sheet metal having a substantially L-shaped cross section composed of an insertion region extending in the Y-axis direction and a bent region connected to one end of the insertion region and extending in the Z-axis direction, A pinch roller fixing mechanism, wherein a threaded member that is threadedly engaged with the mounting member is fitted in the insertion region, and a long hole extending in the Y-axis direction is formed.

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