JPH0719851A - Sheet-thickness measuring apparatus - Google Patents

Abstract

PURPOSE:To provide a sheet-thickness measuring apparatus, which can accurately measure the thickness from the beginning edge to the terminating edge of a sample sheet, can perform the measurement based on the relation between the position in the longitudinal direction and the thickness, and can achieve the simple structure and the compact configuration. CONSTITUTION:Driving rollers 16 and 16' and pinch rollers 15 and l5', which are rotatably supported and form the pairs, are provided so as to face each other so that the rollers are separated with other supporting shafts at the positions at the equal distance on both sides of the width direction of a sample sheet. Thickness detecting heads 46 and 47 are provided on the same axial line between the facing rollers. Both edges of the sample sheet are held with the driving rollers 16 and 16' and the pinch rollers 15 and 15', and the sample sheet is moved. At the same time, the central part in the width direction of the sample sheets enters between the upper and lower thickness detecting heads 46 and 47. When the sample sheet is moved, the thickness detecting heads 46 and 47 are displaced, and the thickness of the sample sheet is detected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet thickness measuring device. More specifically, the thickness of a sample product such as a film-like sheet or a hard plate-like sheet, which is a finished product, The present invention relates to a sheet thickness measuring device used for offline measurement.

[0002]

2. Description of the Related Art For example, whether or not the sheet thickness of a sheet material such as a soft film sheet made of a synthetic resin or a hard plate sheet conforms to a standard is checked by the user on the sample sheet. A sheet thickness measuring device is used for the off-line confirmation inspection.

As shown in FIG. 8 (A), a conventional sheet thickness measuring device has two sets of pinch rollers (2a) arranged in upper and lower two stages in a transfer path of a sample sheet (1).
(2b) and (2a ') (2b') are installed with a predetermined distance in the sheet transfer direction, and pinch rollers (2a) (2
At the intermediate position between b) and (2a ') (2b'), the thickness detection sensor (4) (4 ') such as a linear gauge having the detection rollers (3) (3') attached to the tip is seated ( 1) is arranged so as to face each other, and based on the detection value detected by the detection sensors (4) and (4 ′), the preset reference thickness of the sheet is set to the zero point level, and the actual measurement value is obtained by its positive and negative values. It is intended to be displayed. The pinch rollers (2a) (2b) and (2a ') (2b') of each set described above are roll-shaped extending in the width direction of the sample sheet (1) and each have one long support shaft (5). It is attached on top.

FIG. 8B shows another example of the conventional sheet thickness measuring device, in which the thickness detecting sensor (4) is wound while the starting end of the sample sheet (1) is wound on the winding roller (6). ) (4 ') is to measure the thickness of the sample sheet (1).

[0005]

According to the conventional apparatus shown in FIG. 8A, if the sample sheet (1) is transferred from the left side to the right side in the figure, the starting end of the sample sheet (1) is Even if it is eaten by the thickness detection sensor (4) (4 '),
After that, since the traveling direction of the leading edge of the sample sheet (1) is not fixed and unstable, the sheet thickness cannot be accurately measured, and the leading edge of the pinch roller (2
A sheet thickness cannot be accurately measured until after the point a ') (2b') is eaten. Therefore, in the apparatus of FIG. 8A, the installation distance between the thickness detection sensors (4) (4 ′) and the right pinch rollers (2a ′) (2b ′) on the starting end side of the sample sheet (1). There is a drawback that the sheet thickness in the range of length corresponding to can not be measured. For the same reason, even on the starting end side of the sample sheet (1), there is a range of length corresponding to the distance between the thickness detection sensors (4) (4 ') and the left pinch rollers (2a) (2b). There is a drawback that the sheet thickness cannot be measured.

Further, according to the conventional sheet thickness measuring device shown in FIG. 8A, two sets of pinch rollers (2a) are used.
(2b) and (2a ') (2b') are thickness detection sensors (4)
In contrast to (4 '), since they are installed at a predetermined distance on both sides in the sheet transfer direction, there is a problem that the entire apparatus is large and complicated, and the manufacturing cost is high.

Further, in the case of the conventional apparatus shown in FIG. 8B, the starting end of the sample sheet (1) is taken up by the take-up roller (6).
Since it cannot be measured accurately until it is wound around
At the start end side of the sample sheet (1), the sheet thickness cannot be measured at least for the length corresponding to the installation distance between the thickness detection sensors (4) (4 ') and the winding roller (6). There are drawbacks. For the same reason, there is a drawback that an unmeasurable portion occurs on the end side of the sample sheet (1).

The present invention has been proposed in view of the above-mentioned drawbacks, and provides a sheet thickness measuring device capable of accurately measuring from the start end to the end of a sample sheet, the overall size of the device is small, the structure is simple, and the cost is low. The purpose is to do.

[0009]

In order to achieve the above object, the present invention comprises two sets of drive rollers which are spaced apart in the width direction of a sheet and which are fixedly supported by separate spindles so as to be rotationally driven at the same speed. , Which are rotatably and vertically movably supported on the upper portions of the two sets of drive rollers by separate supporting shafts and are pressed by the two sets of drive rollers via springs.
It comprises a pair of pinch rollers, and a thickness detection head installed between the two sets of drive rollers and two sets of pinch rollers and on the same axis as these.

[0010]

The two sets of drive roller and pinch roller are provided on both sides of the sheet in the width direction on the same axis and separated from each other with different axes, and the thickness detection heads are aligned on the same axis between them. The sheet thickness from the beginning to the end of the sheet can be accurately measured because it is installed.

[0011]

EXAMPLE An example of the sheet thickness measuring apparatus according to the present invention will be described below with reference to FIGS. 1 to 7.

In FIG. 2, (A) shows a measuring unit, (B) shows a controller containing a computer, and (C) shows a CRT display connected to the controller (B).

As shown in FIG. 1, the measuring unit (A) is configured such that a fixed table (11) on which the sample sheet (1) is placed and transferred is horizontally arranged and the fixed table (11) is arranged. A fixed frame (12) on the main body side is provided in parallel with the fixed table (11) at a position above. The upper surface of the fixed table (11) is subjected to surface treatment with less friction such as Teflon coating to prevent the sheets and films from adhering to each other.

As shown in FIG. 4, two sets of paired drive rollers (16) (16 ') and pinch rollers (15) (15') are arranged at equal distance positions on both sides of the sample sheet (1). Are separated from each other in the sheet width direction, and can be vertically contacted and separated via the window holes (17) and (17 ') formed in the fixed table (11), and the lower drive roller ( 16)
(16 ') is level with the upper surface (18) of the fixed table (11), and the fixed frame (12) is placed through the support shafts (19) (19').
It can be rotated by another fixed frame (not shown) integrated with and is supported so as not to move up and down. The upper surface of the fixed table (11) and the surfaces of the pinch rollers (15) and (15 ') are coated with Teflon to prevent the sample sheet (1) from adhering. Further, the surface of the lower drive rollers (16) (16 ') is subjected to slip prevention processing such as knurling. Lower drive roller above (16)
The driven pulley (20) is attached to the support shaft (19) (19 ') of (16').
(20 ') is attached, and the driven pulley (20) (2) is attached to the output shaft (23) of the drive motor (22) with the reduction gear (21).
Install the transmission pulleys (24) (24 ') corresponding to 0'). Above transmission pulley (24) (24 ') and driven pulley (20)
(20 ') and timing belts (25) and (25') are linked so that they can be linked at the same speed, and the rotational force of the output shaft (23) rotationally driven by the driving force of the drive motor (22) is applied to the timing belt ( 25) (25 ') through the lower drive roller (1
6) Transfer to (16 '). One lower drive roller (1
The pulse generator (27) is connected to the support shaft (19 ') of 6') via the shaft coupling (26), and the lower drive roller (16) (1)
The pulse signal is regularly output according to the rotational displacement of 6 '), and the length data of the sample sheet (1) is sent to the controller (B).

The movable bodies (31) and (31 ') are pierced and held at positions symmetrical to both sides of the fixed frame (12) in the seat width direction so as to be vertically movable. The movable body (31) (31 ')
As shown in FIG. 3, the vertical rods (33) (33) are hung vertically on the lower surface of the upper plate (32), and the support arms (34) are attached to the lower ends of the vertical rods (33) (33). And each support arm (34)
Above the upper pinch roller (15) via the support shaft (35)
Install (15 ') rotatably. Support arm (3
Each vertical rod (33) (3) between the 4) and the fixed frame (12)
The compression springs (37) are wound around 3) respectively, and the elastic force of the compression springs (37) causes the upper pinch roller (15) to move.
(15 ') is vertically movable and elastically brought into pressure contact with the lower drive rollers (16) (16'). Above fixed frame (1
Mount the mounting brackets (38) (38 ') with an L-shaped cross section on the upper surface of 2) so as to correspond to the movable bodies (31) (31'). The adjusting screws (39) (39 ') are screwed through the protruding pieces (38a) (38a') protruding in the horizontal direction of the mounting brackets (38) (38 ') so as to be vertically movable. The adjusting plate (41) (41 ') is attached to the upper surface of the upper plate (32) of the movable body (31) (31') through the adjusting spring (40) (40 '), and the adjusting screw (39) is attached.
By appropriately pressing the adjusting plates (41) (41 ') with (39') and compressing and releasing the adjusting springs (40) (40 '), the upper pinch roller is moved through the movable bodies (31) (31'). (15) (1
Adjust the pressing force that acts on 5 ') and adjust the meandering of the work due to the difference in the pressing force on the left and right.

Two pairs of drive rollers (16) forming the above pair.
As shown in FIGS. 1 and 4, at the central position between the (16 ') and the pinch rollers (15) and (15'), the sample sheet (1) on the fixed table (11) is vertically opposed to both sides. The thickness detection heads (46) (47) are arranged. The upper and lower thickness detection heads (46) (47) are attached to the tips of the linear gauges (48) (49) via the mounting brackets (50) (51) and the detection roller (52).
(53) is rotatably mounted, and the detection rollers (52) (53) are attached to the window holes (17) (1) of the fixed table (11).
7 ') are arranged so that they can come into contact with and separate from each other in the vertical direction through an opening (54) formed at a central position between the drive rollers (1).
6) Rolls along the upper and lower surfaces (1a) (1b) of the sample sheet (1) transferred on the fixed table (11) by the rotation operation of (16 ') and the pinch rollers (15) (15'). Is done. When measuring the thickness of the hard plate-like sheet (1), the upper and lower thickness detection heads (46) (47) can be moved up and down, and when measuring the thickness of the soft film-like sheet, The thickness detecting head (46) is movable up and down, and the lower thickness detecting head (47) is fixed for measurement. In this case, the lower thickness detection head (47) does not have to be a sensor.

A guide plate (57) for preventing the sample sheet from being wound around the upper ends of the support arms (34) of the movable bodies (31) (31 ') via support brackets (56) (56').
Install (57 '). The guide plates (57) (57 ') are for preventing the film-like sheet from winding around the detection roller (52) of the upper thickness detection head (46), as shown in FIG. The sample sheet has a boat shape and is vertically disposed inside the detection roller (52) and in parallel with the upper surface (18) of the fixed table (11) with a predetermined gap. The rear end faces (58) (58 ') on the entry side of (1) are formed into curved surfaces. Further, the detection rollers (52) (5) of the thickness detection heads (46) (47)
Part of the mounting bracket (50) (51) with 3) attached,
Removal brushes (59) (60) may be attached to remove dust and the like adhering to the detection rollers (52) (53).

Instead of the detection rollers (52) (53) of the thickness detection heads (46) (47), as shown in FIG.
You may use the detection chip (68) (69) which formed the opposing surface (66) (67) which opposes vertically on the spherical surface. In this case, by setting one or both contact surfaces as flat surfaces (70), it is possible to prevent the occurrence of measurement errors due to the positional deviation of the upper and lower thickness detection heads (46) (47).

In addition to the linear gauge, a non-contact type sensor may be used for the thickness detecting heads (46, 47). As the non-contact type sensor, for example, a reflection type laser displacement meter, an ultrasonic sensor, a capacitance type sensor, an infrared sensor or the like can be used. When such a non-contact sensor is used, wrinkles do not occur on the sample sheet even if the sample sheet is soft.

The controller (B) is a measuring unit (A).
Thickness gauge head (46) (47) linear gauge (48)
Based on the actual measurement value of the thickness of the sample sheet (1) detected by (49) and input as an electric signal, the preset reference sheet thickness of the sample sheet (1) is set to the zero point level, and the actual measurement value of the positive and negative values is obtained. And the total data thereof are displayed on the CRT display (C). The controller (B) starts a reset button (71) for resetting the linear gauges (48), (49), a jog button (72) for feeding the sample sheet (1) by inching, and measurement of the sheet thickness. Is equipped with a speed adjustment knob (74) that can switch and adjust the rotation speed of the drive motor (22) via a measurement start button (73) and a speed setting unit (74a), and a sample sheet reference Thickness setting section (75), sample sheet measurement start and end thickness setting section (76), sample sheet measurement length setting section (77)
Is provided. When the reference thickness of the sample sheet (1) is set to T0 in the reference thickness setting section (75),
The reference thickness T0 is set in the measurement start end thickness setting section (76).
A slightly smaller thickness T1 is set, and the detection rollers (52) of the linear gauges (48) and (49) of the sample sheet (1) are set.
When entering between (53), or the detection roller (52) (53)
When leaving the space, the linear gauges (48) (49) are displaced in the vertical direction, and if the displacement amount reaches a preset measurement start / end thickness T1, the measurement of the sheet thickness is started or finished. It is configured. As described above, the starting point and the ending point of the measurement of the sheet thickness are set by measuring the thicknesses of the front end and the rear end of the sample sheet (1), but in addition to this, the measurement length setting unit (77) It is also possible to preset the measurement length for measuring the sheet thickness in the sample sheet (1) and set the measurement start point and the end point of the sheet thickness based on this measurement length.

Next, the operation of measuring the thickness of the sample sheet by the sheet thickness measuring device according to the present invention will be described.

Prior to the measurement of the sheet thickness, the reference thickness T0 is set in the reference thickness setting section (75) of the controller (B) according to the type of the sample sheet (1), and the measurement start / end thickness setting section ( 76), sample sheet (1)
The thickness T1 is set to be slightly smaller than the reference thickness T0.
Further, the rotation speed of the drive motor (22) is set according to the sample sheet (1) by appropriately switching the speed adjustment knob (74).

Then, a hard plate-shaped sample sheet (1) is placed on the fixed table (11), and the tip end of the sample sheet (1) is pinched into upper pinch rollers (15) (15 ').
And the lower drive roller (16) (16 '). Then, when the measurement start button (73) of the controller (B) is turned on, the drive motor (22) is rotationally driven, and the rotational driving force of the drive motor (22) is increased by the output shaft (23) and the support shaft (1).
9) (19 ') pulleys (24) (24') and (20) (20 ')
Timing belt (25) (2)
5 ') is transmitted to the lower drive roller (16) (16'). By the rotation of the lower drive rollers (16) (16 '), the upper pinch rollers (15) (15') elastically pressed against the lower drive rollers (16) (16 ') are driven to rotate. As a result, the sample sheet (1) has an upper pinch roller (15) (15 ') and a lower drive roller (16) (16').
It is sandwiched between and sent in the longitudinal direction. Then, the center portion in the width direction of the tip of the sample sheet (1) is divided into the upper pinch rollers (15) (15 ') and the lower drive rollers (16) (16') as shown by the alternate long and short dash line in FIG. The detection roller (5) of the thickness detection heads (46) (47) arranged at the central position between
2) Gradually enter between (53). When the sample sheet (1) enters, the detection rollers (52) (53) are pushed and spread in the vertical direction, and the linear gauges (48) (49) are displaced in the vertical direction. B)
When the measurement start end thickness T1 preset in the measurement start end thickness setting section (76) is reached, the measurement of the thickness of the sample sheet (1) is started.

By moving the sample sheet (1) in the longitudinal direction, the detection rollers (52) (53) of the thickness detection heads (46) (47) move to the upper and lower surfaces (1) of the sample sheet (1).
a) Rolled along (1b), the measured value T of the thickness of the sample sheet (1) is sequentially sent to the controller (B) as an electric signal, and the controller (B) presets the sample. It is calculated by comparison with the reference thickness T0 of the sheet (1). The result of this calculation is that the reference thickness of the sample sheet (1) is set to the zero point level, and the actual measurement value of the positive and negative is the length data of the sample sheet (1) sent from the pulse generator (27) to the controller (B). Based on this, the images are displayed on the CRT display (C) at predetermined pitches.

The sample sheet (1) is sent to the pinch rollers (15) (15 ') and the drive rollers (16) (16'), and its rear end has a thickness as shown by a two-dot chain line in FIG. After passing through the detection rollers (52) (53) of the detection heads (46) (47), the detection rollers (52) (53) are gradually closed and the linear gauges (48) (49) are vertically displaced. When the displacement reaches the set value T1 set in the measurement start / end thickness setting section (76), the measurement of the thickness of the sample sheet (1) ends.

In the above embodiment, the case where the thickness of the hard plate-like sheet is measured has been described. However, when the thickness of the soft film-like sheet is measured, the upper thickness detecting head of the thickness detecting heads is used. Is movable, and the thickness detection head below is fixed.

[0027]

According to the present invention, the thickness detecting head is installed between the drive roller and the pinch roller, which are spaced apart from each other and equidistant from each other in the width direction of the sheet, and on the same axis as these. The thickness from the beginning to the end of the sample sheet can be measured accurately and easily, and the pinch rollers are separated from the thickness detection head at a predetermined interval on both sides in the sheet feeding direction as in the conventional case. Since it is not necessary to dispose, the entire device can be downsized, the structure is simple, the manufacturing is easy, and the manufacturing cost is low.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional schematic explanatory view showing an embodiment of a sheet thickness measuring device according to the present invention.

FIG. 2 is an overall explanatory view of the device of the present invention.

FIG. 3 is a side view of a main part of FIG.

FIG. 4 is a perspective view showing an arrangement state of a pinch roller and a detection roller.

FIG. 5 is a perspective view of a guide plate for preventing winding of the sample sheet.

FIG. 6 is an explanatory diagram showing another specific example of the detection roller of the thickness detection head.

FIG. 7 is an explanatory diagram for explaining a procedure for measuring the sheet thickness.

FIG. 8A is an explanatory diagram showing a first conventional example of a sheet thickness measuring device, and FIG. 8B is an explanatory diagram showing a second conventional example of a sheet thickness device.

[Explanation of symbols]

 1 sheet 15, 15 'Pinch roller 16, 16' Drive roller 46, 47 Thickness detection head

Claims (1)

[Claims] 1. A pair of drive rollers that are fixedly supported so as to be rotatably driven at the same speed by separate support shafts separated from each other in the width direction of the sheet, and separate support shafts above the two drive rollers. 2 is rotatably supported via a spring and is vertically movable, and is pressed by the two driving rollers via a spring.
A sheet thickness measuring device comprising a pair of pinch rollers and a thickness detection head installed between the two sets of drive rollers and the two sets of pinch rollers and on the same axis as these.