DE2035182A1 - Flat measuring machine - Google Patents

Description

concerning
"Area measuring machine"
Priority! 7/15/1969 - ENGLAND

The invention relates to machines for measuring surface area of sheet material, especially for use in connection with irregularly shaped pieces of material, such as leather hides, although they are not on this particular subject usage is limited.

The area measuring machine according to the invention has a hollow one translucent or transparent roller over the surface the two-dimensional material to be measured is conveyed in such a way that it receives line contact with this surface, a row fixed photoelectric units, which are parallel to the prehaxis of the roller and on the opposite side of the goods the roller is arranged, a light source for irradiation

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the row of photoelectric units from the roller side of the goods, a device for periodic scanning of the series of photoelectric units for the Transmission of a pulse for each unit that is covered by the material during the scanning process, a pulse counter for summing these pulses, and a switching device that synchronizes with the movement of the planar Good is effective in order to initiate successive scanning processes dirch the scanning device.

The photoelectric units are located at distances from one another, which correspond to the width elements to be measured, and the scanning process is initiated at intervals which are successively equal length sub-amounts of the two-dimensional goods. Therefore, each scan sends a sum of pulses to the counter, which represent the area of the strip of material in the width direction, and give the measurements of successive strips a running total on the meter. This running total will also be advantageously reproduced in a display device, which can be of any known shape and is adjacent to the machine and / or at one or more other locations can be arranged, depending on how it is two-way for the particular environment in which the machine is used shall be. ^

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For precise alignment and straightening of the goods, especially in the case of a dermis that is wrinkled or hollowed out May have parts, it is advantageous to provide a further rotatable roller, which is connected to the first-mentioned roller hereinafter referred to as the primary roller) is parallel and interacts with this, the material through the gap is conveyed between the two rollers.

This second or counter roller can also consist of a transparent one or translucent material and the fixed series of photoelectric units can be within the same be arranged, for example on a rod that is parallel to the axis of rotation of the counter roll (and the primary roll) is arranged.

In a similar way, the light source for irradiating the light-electric units within the primary roller be arranged and a light pipe that extends over the full effective measuring length, i.e. over the full span of the all-electric units.

The switching device can have various forms, wherein the criterion is that it comes into action at intervals that correspond to the feed movement of the workpiece correspond. In a preferred embodiment, a photoelectric device is used which has a

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has piebald or perforated ring, which is rotated by the moving sheet material, and a Photocell array that can be conveniently activated by the light source that controls the counter photoelectric units irradiated. The term "piebald ring" is to be understood here as a ring, which is provided with a plurality of circumferential subdivisions, in which opaque areas with Alternate transparent or translucent surfaces.

This switching ring can in fact form part of the aforementioned counting roller, in which case it is against activation shielded by light from the light source other than that by a window (i.e., a transparent section) thereof can be.

For a better understanding of the invention and to facilitate its practical implementation, it is explained below described in more detail in connection with the accompanying drawings showing an example embodiment thereof represent and show:

1 shows a front view in a diagrammatic representation of a surface measuring machine according to the invention;

Fig. 2 is a view in vertical section through the in

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Fig. 1 illustrated machine and

Fig. 3 is a partial view in vertical cross section through the machine shown in FIG.

The machine shown in the drawings is primarily intended for measuring the areas of leather hides and has a housing 1 which has a substantially rectangular shape and is open at the front. A horizontal platform 2 protrudes from the housing in a position about a third down from the top of the housing and serves as a Support for a dermis that is fed into the machine. Above the platform 2 is inside the housing an inclined shield 3 is arranged. -

The inner end of the platform is in alignment with the Gap of two transparent rollers 4 · arranged, whose Axes parallel and in horizontal positions as well as in the are stored in the same vertical plane. These rollers form the measuring mechanism of the machine and become one to be measured Skin conveyed through the gap between the rollers. A curved baffle 5 extends from that of the plate remote side of the nip to the lower front of the housing and serves to create a leather skin, the surfaces of which » content has been measured when passing through the nip

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is to lead out of the machine.

From Fig. 3 it can be seen that the ends of the rollers 4 are mounted in the side walls 1 a of the housing 1. The ends of the lower roller 4b are in fact in fixed positions supported, while the ends of the upper roller 4a are slidable in vertical slots 6, which movement allow the roller to the lower roller 4b or away from this, in order to take into account the different thicknesses of the leather. No leather is shown in the drawing, which is located in the machine, so that the roller 4a by its own weight in surface contact with the Roller 4b is loaded.

As shown, the spindle of each roller 4 carries at each end a bearing 7 which enables the transparent tubular part 8 of the roller to rotate with respect to the spindle. In the present case 8 supports the part of the lower roller 4b, a pulley 9, which can be driven for rotation via a belt by an electric motor 10 _s the side of the housing of the machine is disposed, "The roller 4a rotates by the contact with the roll 4b or by touching a piece of leather. moving through the nip. '.

On the spindle 11 of the roller 4b are two plates 12 (.Fig.2)

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fixedly arranged, which are parallel to each other and in the Extend the longitudinal direction of the roller and carry a rod 13 between them, on which a longitudinal row of photoelectric Cells 14 is attached. These cells are spaced apart from one another by a certain distance, which is the same as the units of width of the one to be measured To match the piece of leather. The arrangement. Is such that the cells 14 are directed towards the roller 4a and. as a matter of fact lie in the plane which contains the axes of the two rollers. A fluorescent tube 15 is arranged axially to the roller 4a, so that it normally irradiates the photocells 14 through a slot 16 in the spindle of the roller '.

The photoelectric cell 14a at the far right end the roller 4h is covered by a perforated band 17 which is attached to the inside of the'walze'4b. The distance of each pair of adjacent perforations in the band "17 is equal to a unit length of a piece of leather conveyed through the gap between the rollers 4. Hence the time represents between two successive pulses from this photocell represents a unit of length of such a piece of leather mentioned photocell and the tape form the aforementioned Switching device.

The lines 18 leading away from the photocells 14 run through an opening in the spindle of the roller 4b to an integrated

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grating. Pulse counter having a scanning device which is designed so that every time the photocell 14a is illuminated, the remaining photocells are scanned and the counter records the number of cells that are not currently being irradiated. This number is of course replaced by the Determines the width dimension of a piece of leather guided through the nip. If the spacing of the cells and the The distance between the perforations in the band 17 can be assumed to be known, the total surface area of the leather between the rollers per unit length (which is equal to the distance between successive perforations in the belt 17) Integration in the meter can be calculated and is displayed on a display device of the meter. Hence, through • Continuous summation of these impulses with each activation of the photocell IUa a running sum of the area of a piece of leather passed through the machine.

The pulse counter can be of any suitable electronic type be of an integrative nature. In the present case he can for example be of decadal nature and the measurement parameters (the distance between the photoelectric units, the distance of the perforations in the band 17) can be chosen so that the counting is in units of hundredths of a square foot.

According to a further feature of the invention, the 2'Uiler το

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be trained that he when inserting a new one Piece of material is reset to zero in the machine. This means that the one shown on the display device Number is not deleted immediately after the end of the measurement of a piece of material or only to one by the operator by introducing the next piece a certain point in time is deleted, which in some cases is copious Gives the opportunity to record the reading, for example on the measured skin.

This can be achieved by installing a two-state sensor circuit in the connections of the meter. which is switched from one state to the other, when the first pulse is received from the row of photoelectric units 14 when that row is being inserted of a fresh piece is scanned first, which change of state is used to generate an erase pulse generator trigger and then reset the counter.

Another feature that can be built into the meter can, is an arrangement to compensate for a fraction under-measurement, which in most cases otherwise at the end of a Measurement would take place when the actual number exceeds the registered one, but the next one does not Number has reached.

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For this purpose, at least one pulse divider can be connected to the input side of the counter to keep the count trigger when receiving only part of the group of pulses that form under normal operating conditions the first digit on the display device may be required. The counter is also provided with a connection to bypass this divider for normal reading when a number Impulse corresponding to the subgroup mentioned has been received.

Claims;

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Claims (1)

- ii - P at ent claims: 1. \ Area measuring machine, characterized by a hollow translucent or transparent roller (4a), over the surface of which the flat material to be measured is as follows is promoted that it receives line contact with this surface, a series of fixed photoelectric units (14), which are parallel to the axis of rotation of the roller (4a) and a light source (15) for irradiation is arranged on the opposite side of the material on the roller the series of photoelectric units (14) from the roller side of the good, a device for periodic scanning of the range of photoelectric units for the transmission of a pulse for each Unit that is covered by the material during the scanning process, a pulse counter to add them up Pulses, and a switching device (14a; 17), which synchronously is effective with the movement of the sheet-like material in order to initiate successive scanning processes by the scanning device * 2. Machine according to claim 1, characterized by a v / pus 009885/1603 Roller (4b), which is arranged parallel to the transparent or translucent roller (4a), wherein the extensive material is conveyed through the gap between the two rollers. 3. Machine according to claim 2, characterized in that the first-mentioned roller (4a) for movement on the other Roller (4b) is mounted to or away from this to a different thickness of the through the nip to be able to take into account funded extensive goods. 4. Machine according to claim 2 or 3, characterized in that said further roller (4b) consists of a transparent one or translucent material and the aforementioned series of solid photoelectric units (14) inside this roller and parallel to its axis . is arranged. 5. Machine according to claims 1-4, characterized in that the light source (15) for irradiating the photoelectric units (14) is formed by a fluorescent tube that is inside the first 009885/1603 th roller (4a) is arranged and over the full effective measuring width thereof extends. 6. Machine according to the preceding claims, characterized characterized in that the switching device has a perforated ring (17) which passes through the contact can be rotated with the two-dimensional good, the area of which is to be measured, and one photoelectric unit C14a) which during rotation of the ring can be repeatedly irradiated through it, the distance between successive Perforations in the ring (17) represent a unit of length of the goods. 7. Machine according to claims 4 and 6, characterized in that that the perforated ring (17) is arranged on or in the mentioned further roller (4b) and the photoelectric unit (14a) of the switching device by one of the photoelectric units in the roller (4b) is formed. 8 «Machine according to the preceding claims, thereby 009885/1603 characterized in that the pulse counter is designed so that it is when a new good piece is inserted is reset to zero in the machine. 9. Machine according to the preceding claims, characterized in that the pulse counter is a display device having, and at least one pulse divider connected to the input side of the pulse counter is to trigger the counting when only part of the pulse group is received, which under normal operating conditions would be necessary to generate the first digit on the display device, and a connection to bypass the pulse divider for normal reading when a number of pulses which corresponds to this subgroup ~ has been received is. For USMC International Limited 009885/1603 Blank page