JPH03206845A - Method for correcting and measuring steaming time in tea making and correcting and measuring device - Google Patents

Abstract

PURPOSE:To make it possible to nearly continuously measure steaming time of leaf of tea continuously passing through a steaming drum by dividing weight of tea leaf obtained by correcting error by gradual increase of deposition of tea ground to steaming drum, etc., by feed amount per hour. CONSTITUTION:A setting value of flow rate setting device 14 of leaf feeding machine 11 or measured value of flow rate-measuring device 15 is read into RAM (control circuit). On the one hand, weight of tea leaf which is passing through a steaming drum 1, namely changed amount of voltage value shown by detector 8 of displacement amount is also read. Correction operation subtracting amount of tea ground deposited between start time of steaming and time measured from the changed amount is carried out and then operation dividing the latter by the former is carried out to correct and measure time passing through the steam drum, namely steaming time. Then when amount of tea ground deposited during measuring time is subtracted, the subtraction is not carried out by directly measuring deposited amount of actual tea ground, but carried out by obtaining estimated amount of deposition of tea ground at the point of measured time from table or drawing, etc., prepared by previously obtaining by experiment, etc., and subtracting the resultant value.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a novel method for measuring tea steaming time, which can be measured almost continuously by correcting errors caused by deposition, and which also eliminates time delays in the timing of measurement. will not occur,
It is an object of the present invention to provide a tea manufacturing steaming time correction measurement method and a tea manufacturing steaming time measurement correction device.

Background technology and its problems The tea manufacturing process (rough tea process) consists of an initial steaming process, subsequent rolling and drying processes, and a final drying process. The steaming process is so important that it is said to determine the value of the raw tea product.

This steaming process quickly loses the activity of oxidizing enzymes contained in the fresh leaves, maintains the bright green color unique to green tea, dyes the leaf color that permeates from the tea leaves, removes the grassy odor, and gives off the Ibara's distinctive aroma. The purpose is to lift the fresh leaves and soften the leaf quality, etc., and the raw leaves introduced from the inlet of the steamer barrel are transported to the outlet of the steamer barrel mainly by the tilting of the steamer barrel, the rotation of the steamer barrel, and the rotation of the stirring shaft. This is done by heating the steam by the steam supplied to the steamer while passing through it, and applying pressure by the rotation of the steamer and the stirring shaft.

The factors that influence the degree of achievement of each of the above objectives include the temperature, amount, and pressure of steam, the degree of pounding or rolling pressure, the amount of fresh leaves input, and the steaming time, that is, the time the fresh leaves pass through the steamer barrel. Of course, these factors are not individually involved in achieving the above-mentioned objectives, but are involved in a complex manner, and among them, steaming time is an especially important factor. This is because the length of steaming time has an extremely large effect on fresh leaves compared to other factors such as the properties of the steam and the degree of pressure, and subtle differences in steaming time can affect the physical changes that fresh leaves undergo. This is because the chemical denaturation is significantly different. This physical change or chemical modification is
This refers to softening of the fibers of tea leaves, destruction of cells, and denaturation of color and aroma components.These changes and denaturation determine the properties of the steamed leaves, which in turn determine the color, aroma, and light color of the finished tea product. , flavor, and other qualities will be greatly affected.

Therefore, when performing the tea steaming process, it is necessary to manage the steaming time with great care, and this is based on data on how long the steaming time is and what quality of steamed leaves are obtained. It is necessary to set a desired specific steaming time and to accurately manage the set steaming time. If the steaming time is controlled in this way, the quality of the steamed leaves will be more stable, and
In addition to this, it is possible to obtain steamed leaves that are steamed to a desired finished quality.

However, in the conventional steaming process, the steaming time is not actively controlled, and at best, the steaming time is controlled based on uncertain factors such as intuition and experience based on the finished quality of the steamed leaves. It was just a matter of adjusting the elements appropriately.

The actual state of conventional steaming time management will be explained with reference to FIG. 11.

In the figure, a indicates a steamer main body, b a leaf feeder, and C a cooling machine. d is a steaming barrel, and the steaming barrel d is a fixed barrel g having an input port e formed at one end and a steam supply section f formed at the other end.
and a rotating body connected to the fixed body g.

The steam barrel d is supported by a movable frame i, and the movable frame i is rotatably supported by the machine frame j. k is the rotation fulcrum of the movable frame i, ■ is the trunk inclination steel joint mechanism, m
is a working lever of the adjustment mechanism 1; n is a stirring shaft passing through the steamer drum d in the axial direction; a large number of stirring blades (not shown) are protruded from the stirring shaft n; 0 is a drive unit, and the drive unit O
is equipped with a drive mechanism for driving the rotating barrel and stirring shaft n.

The fresh leaves are fed into the steamer barrel d from the input port e of the fixed barrel g by the leaf feeder, and are transferred within the steamer barrel d for a passage time of several tens of seconds to several minutes, and during this transfer. The above-mentioned physical changes and chemical denaturation are carried out while being subjected to heating by steam, the rotating action of the rotating barrel, and the impact pressure and stirring caused by the rotating action of the stirring blades protruding from the stirring shaft n, and the tip of the rotating barrel is removed. It is discharged from the steam barrel d from the outlet p. The steamed leaves discharged from the steamer drum d are cooled by a cooler C and then transferred to the next rough-crushed step.

The tea caddy that controls the steaming process is the outlet p of the steamer barrel d.
We occasionally sample the steamed leaves discharged from the
Immediately judge the finished quality of the steamed leaves by sensually capturing the scent, the elasticity and stickiness when held in the palm of your hand, and the dew on the leaf surface, and if you are dissatisfied with the results,
Control elements such as the rotational speed of the rotating barrel, the rotational speed of the stirring shaft n, the (lJ! slope of the steaming barrel d, and the properties of steam) are adjusted as appropriate.

Among these control elements, the rotation speed of the rotating barrel and the stirring shaft n
The rotational speed of the steamer d and the degree of inclination of the steaming drum d are factors that directly relate to the appropriate time for fresh leaves to pass through the steamer d, that is, the steaming time.In particular, the degree of inclination of the steamer d is a factor that greatly influences the steaming time.

The conventional steaming process is carried out as described above, and the steaming time is managed using a so-called hands-on method in which control elements are adjusted as appropriate while sampling the finished quality of the steamed leaves. By the way, if a satisfactory finished quality of steamed leaves is obtained when the control elements such as the inclination of the steamer drum d are adjusted to a certain control state, then the inclination of the steamer drum d can be changed to the adjusted state. If you leave it as is, you should be able to get a certain level of steaming quality. However, the appropriate time for fresh leaves to pass through the body depends not only on the above-mentioned mechanical control elements (but also on the amount and quality of fresh leaves input), and it also depends on the amount and quality of fresh leaves that accumulate on the steamer barrel and prevent heating. Since conditions vary, the finished quality of steamed leaves may not always be constant even under the same control conditions.

Therefore, in the conventional steaming process, the steaming time is managed by checking the finished quality of the steamed leaves, adjusting the control elements as appropriate, checking the quality of the steamed leaves in the adjusted state, and making further adjustments if necessary. They were forced to use an extremely complicated method of repeatedly checking and checking.

Moreover, such adjustment work requires extremely delicate techniques and many years of experience, and even with such skilled techniques, it is impossible to achieve a constant steamed leaf quality.

As mentioned above, the conventional steaming process is not carried out while controlling the steaming time (it is carried out while controlling the quality of the steamed leaves based on empirical judgment of the tea caddy).

Purpose of the Invention The present invention has been made in view of the above-mentioned problems and the possibility that debris such as tea stems accumulates in the steamer barrel over time, which may cause an error in measuring the steaming time. To provide a novel tea steaming time correction measuring method and a steaming time correction measuring device, which can substantially continuously measure the steaming time of tea leaves that continuously pass through a steamer barrel by correcting the errors. The purpose is to

Orthotropy is determined by measuring the weight of the tea leaves passing through the steamer barrel, including the frame that supports the steamer barrel, and on the other hand, calculating the amount of tea leaves supplied per unit time by the leaf feeder that supplies fresh leaves into the steamer barrel. When measuring the set or actual supply amount per unit time and determining the weight of tea leaves passing through the steamer barrel, it is necessary to calculate the adhesion of waste at that point from the weight of the frame that supports the steamer barrel. The predicted amount of tea leaves is subtracted to correct the error due to the gradual increase in adhesion of residue to the steamer barrel etc. over time, and the weight of tea leaves obtained by this correction is divided by the set or measured supply amount per unit time. A means for calculating the time for tea leaves to pass through the steamer barrel, a means for weighing the weight of the tea leaves passing through the frame supporting the steamer barrel, and a means for calculating the supply amount per unit time of a leaf feeder that supplies fresh leaves into the steamer barrel. A means for setting a target value or a means for measuring the current value of the supply amount per unit time, and a means for subtracting and correcting the weight of tea leaves obtained by weighing each frame that supports the steamer drum by the predicted amount of deposits at that point in time. The method is characterized by comprising an arithmetic circuit that divides the tea leaf weight by a set target value or measured current value of the supply amount per unit time after the weight is determined.

Embodiment FIG. 1 is a schematic diagram illustrating the basic principle of tea manufacturing and steaming time measurement and its correction.

Reference numeral 1 indicates a steam barrel formed in a generally cylindrical shape as a whole.

The steamer cylinder 1 is composed of a fixed cylinder 2 and a rotary cylinder 3 arranged so that its connecting opening abuts against the tip opening of the fixed cylinder 2. Reference numeral 4 indicates an input port formed at the upper part of the base end of the fixed barrel 2, and 5 indicates a cylindrical steam chamber provided so as to surround the outer peripheral surface of the tip end of the fixed barrel 2. A stirring shaft with stirring blades protruding through the steamer barrel 1 is passed through, and a driving section is arranged on the base end side of the fixed barrel 2, and this driving section rotates the rotary barrel 3 and the stirring shaft. It is designed to be driven. Further, the inclination of the steam barrel 1 can be adjusted by an appropriate inclination adjustment mechanism, and further,
The tea leaves are supported on a base 7 via springs 6, so that the weight of the tea leaves passing through the steamer barrel 1 can be determined by weighing the steamer barrel 1, the drive unit, the inclination adjustment mechanism, and the frame that supports them. has been done.

8 is a displacement detector such as a potentiometer or a differential transformer, and is equipped with a variable resistor 9 and a movable element 10 for changing the resistance value of the variable resistor 9. The movable element 10 is operated in conjunction with the vertical displacement movement of the steam barrel 1.

Reference numeral 11 denotes a leaf feeder capable of constantly supplying a constant weight of tea leaves to the steamer barrel 1. Its delivery end faces the input port 4 of the steamer barrel 1, and a leaf feeder 11 is provided above the hopper of the leaf feeder 11. is transport aircraft 1
The sending end of No. 2 is facing forward.

Therefore, when fresh leaves are supplied from the transporter 12 into the hopper of the leaf feeder 11, the fresh leaves are fed from the delivery end of the leaf feeder 11 through the input port 4 of the fixed cylinder 2 into the steamer cylinder l. , steamer barrel 1
The fresh leaves introduced into the steamer barrel 2 are moved from the fixed barrel 2 to the rotating barrel 3, and are discharged to the outside of the steamer barrel 1 from the outlet 13 of the rotating barrel 3. While being transferred inside the steaming barrel 1, it is heated by the steam supplied from the steam chamber 5, and is stirred and pressed by the rotary barrel 3 and the stirring blade, and is subjected to these heating, stirring, and pressing pressures. Steaming is performed by

Moreover, when fresh leaves are supplied into the steamer barrel 1, the steamer barrel 1
The tea leaves are displaced downward by the weight of the introduced tea leaves together with the supporting frame, and the resistance value of the variable resistor 9 of the displacement amount detector 8 is changed in conjunction with the displacement operation. The resistance value at this time varies depending on the weight of the tea leaves being steamed while passing through the steamer barrel l.

The tea leaves that have been steamed in the steamer barrel 1 are led from the outlet 13 of the steamer barrel 1 to a cooler (not shown) and sent to the next rough rolling process.

14 indicates how much fresh leaves the leaf feeder 11 regularly feeds into the steamer barrel 1.
15 is a flow meter that measures how much weight of fresh leaves is actually being fed per unit time, and the leaf feeder 11 is The conveyance speed and conveyance thickness are feedback-controlled so that the current value of the supply amount measured by the flow meter 15 matches the set target value set in the flow rate setting device 14.

EPROM is a read-only memory in which calculation programs and the like are written. The RAM is a random access memory, and the CPU is a central processing unit, which calculates the steaming time according to an arithmetic program written in the EPROM. DISP is a display means, and in this embodiment, an LED is used to display the steaming time. EXIT is an external output terminal, which sends out a signal for adjusting the inclination of the steamer drum, for example, according to the calculated steaming time.

IN is an input terminal, into which a signal representing a set value of the flow rate setting device 14 of the leaf feeder 11 or a measured value of the flow rate measuring device 15 is inputted.

The steaming time is basically determined by weighing the weight W of the tea leaves passing through the steamer barrel 1 along with the frame supporting the steamer barrel 1, and on the other hand, the weight W of the tea leaves passing through the steamer barrel 1. divided by the set target value Q1 of the supply amount per unit time of the leaf feeder 11 that supplies fresh leaves into the steamer barrel l or the measured current value Q2 that is actually supplied (calculate the formula W+Q1 or W+Q2) ), and calculate the time T for the tea leaves to pass through the steamer barrel.However, weighing the entire frame that supports the steamer barrel would also include weighing the residue attached to the steamer barrel, etc. It is necessary to make corrections.

That is, the set value of the flow rate setting device 14 of the leaf feeder 11 or the measured value of the flow rate meter 15 is read into the RAM, while the weight of tea leaves passing through the steamer barrel 1, that is, the voltage indicated by the displacement amount detector 8 is read into the RAM. The amount of change in value is also read into the RAM, and after a correction operation is performed to subtract the amount of residue that has adhered between the start of steaming and the measurement time from this amount of change, an operation is performed to divide the latter by the former. The time taken to pass through the steamer barrel, that is, the steaming time, is corrected and measured.

When subtracting the amount of debris that has adhered up to the time of the measurement, it is not necessary to directly measure the actual amount of debris that has adhered, but rather to use a table or line that has been created by calculating it through experiments in advance. The predicted amount of debris adhesion at the time of measurement is determined from the top of the diagram, and this value is subtracted.

For example, if the weight of tea leaves passing through the steamer barrel 1 is predicted, this 0.5 kg is subtracted to obtain a net weight of 4 kg, and the measured value Q2 of the supply amount is determined to be 360 kg/h. If so, the steaming time T is calculated to be 40 seconds.

Note that the timing for determining the weight W of tea leaves passing through the steamer barrel can be determined arbitrarily, but when operating some control element related to the steaming time based on the calculated time T of tea leaves passing through the steamer barrel, It is preferable to set the timing to take into account the response delay time due to the operation of each control element.

By the way, in the present invention, as mentioned above, it is also necessary to know the amount of fresh leaves supplied into the steamer drum 1 per unit time as a set value or a measured value. It is necessary to use a leaf feeder equipped with a control mechanism for constantly supplying the supplied amount of fresh leaves, or at least a leaf feeder that can freely measure the actual supplied amount.

Of course, just like a conventional leaf feeder, the supply amount per unit time can be adjusted by volume by adjusting both the circulating speed of the belt and the height of the leveling tool installed above the feed end. Although it is not impossible to measure the steaming time by referring to a conversion table, etc., in this case, it is difficult to measure the steaming time due to changes in the properties of the fresh leaves themselves, such as size, softness, and bulk density. This is not possible at all, and errors in the supply amount of the leaf feeder will cause further errors.
Since this is a highly accurate steaming time correction measurement obtained by subtracting and correcting the amount of residue attached over time, it is recommended to use a leaf feeder that can feedback control the feed amount or a leaf feeder that can measure the current feed amount as described above. It is highly recommended to use a machine. As such a leaf feeder, for example, Japanese Patent Application Laid-Open No. 53-10749
Although there are devices described in Japanese Patent Application Laid-open No. 55-96425, a new leaf feeder which is useful for correcting and measuring tea steaming time according to the present invention will be described with reference to FIG.

Reference numeral 16 designates an inclined conveyor frame which is supported vertically movably with respect to a base frame 18 by four-bar parallel links 17, and is balanced with a weight 20 by balance rods 19, and a crosspiece is provided between rollers supported at both ends of the conveyor frame. A hopper is provided at the starting end of the belt 21, and a spring 22, a rack 23 and a pinion 24 pivotally connected to the inclined conveyor frame 16 are installed between the inclined conveyor frame 16 and the base frame 18. A displacement detector 26 consisting of a variable resistor 25, such as a potentiometer, is mounted on the base frame 18 and is pivoted thereon.

27 is a vertical packet conveyor which is a transport device for feeding fresh leaves into a hopper, 28 is a drive motor for the vertical packet conveyor 27, and 29 is a variable speed drive that drives the crosspiece belt 21, which is stretched over the inclined conveyor frame 16, at variable circulation speeds. It's a motor.

A vibrating gutter 30 is supported by a leaf spring 31 on the protruding side 18a of the base frame 18, and is driven by an eccentric drive mechanism 32. The conveyance capacity of the vibrating gutter 30 and the conveyance capacity of the vertical packet conveyor 27 are assumed to be sufficiently larger than the conveyance capacity of the bell 1-21 with a crosspiece mounted on the inclined conveyor frame 16.

The EFROM is a read-only memory, and the control program for processing, the calculation program, and the standard initial rotation speed of the variable speed drive motor 29 for passing the set target value are stored based on the table and the calculated current supply amount. belt 21
A large number of conversion formulas and the like are written for changing the rotational speed of the variable speed drive motor 29 that drives the motor. RAM is random access memory.

The CPU is a central processing unit that calculates the current supply amount according to the control program and arithmetic program written in the EFROM, issues drive/stop signals to the drive motor 28 of the vertical packet conveyor 27, and outputs a drive/stop signal to the variable speed drive motor 29. The above-mentioned gear change command is issued.

33 is a flow rate setting device, which is similar to the flow rate setting device 14 in FIG.
corresponds to

DISP is a display means, EXIT is an external output terminal,
The set value set in the flow rate setting device 33 or the calculated measured value of the current supply amount is sent out and connected to the input terminal IN in FIG.

After setting the target supply amount Ql in the flow rate setting device 33, when the control power switch is turned on, the drive motor 28 rotates and feeds fresh leaves onto the belt 21 with a crosspiece inside the hopper, and the variable speed drive motor 29 RA corresponding to the set target value
It starts rotating at the initial rotation speed R read from inside M, and the belt with crosspiece 21 discharges the fresh leaves received in the hopper onto the vibrating gutter 30 from its delivery end. The vibrating gutter 30 supplies the fresh leaves one after another to the steamer.

At this time, since the conveyance capacity of the vertical packet conveyor 27 is far superior to the conveyance capacity of the belt with crosspieces 21 of the inclined conveyor frame 16, fresh leaves gradually accumulate on the belt with crosspieces 21 in the hopper.

Then, the weight of the accumulated fresh leaves causes the inclined conveyor frame 16 to be displaced downward, and in conjunction with the displacement operation of the inclined conveyor frame 16, the rack 23 of the displacement amount detector 26 is moved downward, whereby the binion 24 is moved downward. As the variable resistor 25 is rotated, the resistance value of the variable resistor 25 is changed.

Therefore, the voltage value indicated by the displacement amount detector 26 has a magnitude corresponding to the weight of the fresh leaves placed on the crosspiece belt 21.

When this value matches the value stored in the RAM as an upper value by a setting means (not shown), the CPU issues a stop command to the drive motor 28 of the vertical packet conveyor 27, while only the variable speed drive motor 29 is driven as it is, and only the fresh leaves continue to be discharged by the crosspiece belt 21.

Then, as the fresh leaves are discharged, the inclined conveyor frame 16 is displaced upward, and in conjunction with the displacement operation of the inclined conveyor frame 16, the rack 23 of the displacement detector 26 is moved upward, thereby causing the pinion 24 to rotate in the reverse direction. The resistance value of the variable resistor 25 is changed.

When the vertical packet conveyor 27 is stopped and only the crosspiece belt 21 is driven, the CPU samples the weight reduction transition data by reading the voltage value indicated by the displacement amount detector 26 into the RAM at appropriate intervals.

This reading is performed by a setting means (not shown) until the value stored in the RAM as a lower value is reached.

When the voltage value indicated by the displacement amount detector 26 matches the lower value, the CPU again controls the drive motor 2 of the vertical packet conveyor 27.
A drive command is issued to 8, and the feeding of fresh leaves into the hopper is resumed.

On the other hand, immediately write the weight loss trend data as Y=AX+B
In order to approximate the straight line, the least squares method is used to calculate the value of A-B, and the value of A is calculated as the current measured value of the supply amount Q.
During this time, fresh leaves are accumulated in the DISP as shown in FIG. . When the lower value is reached again, the least squares method is immediately performed to calculate the latest measured current value. And at the same time,
Based on the value, the rotational speed of the variable speed drive motor 29 is corrected again, the vertical packet conveyor 27 is driven again, and the accumulation of fresh leaves on the belt 21 inside the hopper is resumed. This cycle is repeated, and the flow rate is Feedback control is performed so that the calculated current measured value approaches the set target value set by the setting device 33.

Therefore, for the supply amount per unit time of the leaf feeder, which is essential for the steaming time correction measurement of the present invention, the set target value Ql set by the flow rate setting device 33 should be read into the RAM shown in FIG. , the measured current value Q calculated as A
If 2 is read, highly accurate steaming time correction measurement becomes possible.

Note that FIG. 3 is a block diagram showing an example of a control circuit of the leaf feeder shown in FIG. 2.

In addition, in the explanation up to now, the device for correcting and measuring the steaming time and the leaf feeder have been explained as separate devices for understanding the invention using FIGS. 1 to 3, but the CPU, RAM, E
It is desirable to construct a total management system by configuring the arithmetic circuits to perform each arithmetic process by sharing a PROM or the like and interrupting each other's arithmetic processes.

In the tea steaming time correction measuring method of the present invention, the measured steaming time at the current point in time is outputted to the display, and this is displayed on the display, and the steaming time in the steamer is monitored while watching the displayed current steaming time T. It is possible to manually adjust control elements such as the inclination of the steamer barrel 1 and the rotational speed of the rotary barrel 3 and the stirring shaft, which are involved in the
Further, the measured current steaming time T may be compared with a preset steaming time, and if there is a discrepancy, the control element may be automatically controlled so that the steaming time matches the set steaming time T. It is possible.

Next, a specific example of a tea steaming apparatus incorporating the tea steaming time correction measuring device of the present invention and automatically controlling the steaming time will be described with reference to FIGS. 4 to 10.

4 to 6 show an example of a steam machine main body including an operating section. In the figure, reference numeral 34 denotes a middle frame support frame, which is framed by appropriate square members. For convenience of explanation, the following explanation will be given using FIG. 6 as a front view and determining the direction of each part.

Reference numeral 35 denotes a movable middle frame, which is built into the middle frame support frame 34 with its left and right ends protruding from the middle frame support frame 34. The part near the left end of the movable middle frame 35 has two hanging fittings 36.
The arm shaft 39 is rotatably supported on a hanging shaft 37 via a support arm 36, and the arm shaft 39 is rotatably supported on a suspension shaft 37 via support arms 38 and 38, and the arm shaft 39 is rotatably supported on a suspension shaft 37 via support arms 38, 38. It is supported by arms 40, 40 (the support arm 38 and the rotating arm 40 on the back side overlap with those on the front side, so they do not appear in the drawing). Reference numeral 41 denotes a fan-shaped gear attached to the front end of the arm shaft 39, and is meshed with a worm gear 43 of the shaft of a trunk side tilt control motor 42 attached to the middle frame support frame 34. Therefore, by rotating the motor 42, the movable middle frame 35 rotates about the hanging shaft 37, and the degree of inclination of the movable middle frame 35 hitting steam barrel can be adjusted by such an operating section.

The main body of the steamer cylinder 44 and the drive section 45 are placed on the movable middle frame 35. The steam barrel 44 includes a substantially cylindrical fixed barrel 46 called a head, a cylindrical steam chamber 47 provided so as to surround the outer peripheral surface of the tip of the fixed barrel 46, and a steam chamber 47 that is connected to the head (fixed barrel) 46 from the right side. The main component is a rotating cylinder 48 made of a cylindrical mesh whose openings are arranged so as to meet each other, and a steam chamber 47 and a head (fixed cylinder) 46 are fixed to the movable middle frame 35. , the rotary cylinder 48 is rotatable.

That is, the rotating barrel 48 has a rim 49 at its right open end supported by two side bearing rollers 50 and 50 attached to the movable middle frame 35, and an annular gear 51 at the left end has its front lower part connected to the receiving gear 52. The rear lower portion is supported by drive gears 53 that mesh with the annular gears 51, respectively. Note that since the drive gear 53 is attached to a rotary drum drive shaft 54 extending from the drive section 45, the rotary drum 48 is rotated by these mechanisms.

Further, a stirring shaft 55 is rotatably arranged inside the fixed cylinder 46 and the rotating cylinder 48, which are cylindrical as a whole, and the left and right ends 56 and 57 of the stirring shaft 55 are connected to the movable middle frame 35.
The left end 56 of the shaft 55 is supported by the drive section 45.
It is connected to a stirring shaft drive shaft 58 that protrudes from the stirring shaft. Further, the stirring shaft 55 has a large number of stirring blades 59, 59,
... are attached radially outward from the center of the shaft.

Since the steamer barrel has a structure in which the stirring blade rotates inside the wire mesh wall, the tea stalks turn into waste and stick to the entire mesh, clogging the entire mesh.

A fixed cover 60 surrounds the rotating body 48 from above and below;
Reference numerals 1 and 61 indicate adjustment covers, and the fixed cover 60 can be removed by removing screws, and the adjustment covers 61 and 61 can be opened and closed by pulling handles 62 and 62.

Inside the drive unit 45 are a drive motor for rotating the rotary drum 48 and the stirring shaft 55, a reduction mechanism with a constant reduction ratio consisting of large and small pulleys, and a speed reduction mechanism for changing the rotational speed of the rotary drum 48 and the stirring shaft 55. (control element operation section) is included.

Various methods can be considered to change the rotation speed, such as making the motor rotation speed itself variable, changing the diameter of the pulley, and using a fluid coupling, but in this example, the speed change mechanism shown in FIG. is used. That is, 63 in the figure is a driven shaft, which corresponds to the aforementioned rotary drum drive shaft 54 or agitation shaft drive shaft 58, or a deceleration intermediate shaft thereof. 64 is a driven variable diameter pulley that is pivotally attached to the driven shaft 63, 65 is a drive motor, and a drive variable diameter pulley 66 is attached to the shaft. And 67
is a speed change control motor, and its rotation rotates the movable piece 68 of the drive variable diameter pulley 66 to move it back and forth in the axial direction to control the interval between the movable side groove walls 69. On the other hand, the driven variable diameter pulley 64 The interval between the movable side groove walls 69 is widened or narrowed according to the length of the belt 70, and the rotation speed is changed by changing the diameters of the pulleys.

Reference numeral 71 denotes a base, which is constructed in a convex shape from the front, and arm shafts 73, 73 supported above and below the right side column 72 of the convex portion have one end attached to the center support column 74 of the middle frame support frame 34. The other ends of parallel arms 75, 75 attached above and below are pivotally connected, a balance rod 76 is attached in the opposite direction to the lower arm shaft 73, and a weight 77 is locked to the tip of the balance rod 76. , steamer barrel 44
It is movable up and down in balance with the total weight of the middle frame support frame 34 to which all necessary members such as the drive unit 45 and the movable middle frame 35 are attached.

Reference numeral 78 is a spring corresponding to the spring 6 in FIG. 1 which explains the principle of steaming time measurement, and the middle support frame 34 that supports the steaming barrel 44 etc. is the balance rod 76 as described above.
Since it is balanced with the weight 77, it expands and contracts up and down depending on the weight of the tea leaves passing through the steamer barrel 44, and is not affected by the amount of M in the steamer barrel 44, drive unit 45, frames 34, 35, etc. It is possible to measure weight.

79, a pinion 81 is pivotally attached to a variable resistor 80 such as a potentiometer fixed to a base 71, a rack 82 is attached as a movable element to the middle frame support frame 34, and these pinion 8 tracks 82 are meshed. This is a displacement detector and corresponds to the displacement detector 8 in FIG.

Reference numeral 83 is an oil damper for damping the vertical vibration of the middle frame support frame 34. A cylindrical bot 84 mounted on the base 71 is filled with machine oil, and a piston 85 loosely fitted into the inner peripheral wall of the cylindrical bot 84 is installed. The piston 8 is immersed in the machine oil.
5 is suspended from the middle frame support frame 34. 86 is an input port that opens near the upper left end of the fixed barrel 46, and a square funnel-shaped funnel 87 is fixed to the input port 86. A screw 89 driven by a small motor 88 is installed inside the funnel 87, and serves to quickly guide fresh leaves introduced into the funnel 87 into the fixed barrel 46. Funnel 87, small motor 88 and screw 89
is supported on the middle frame support frame 34 or the movable middle frame 35 to eliminate as much as possible the interference of the force from the leaf feeder side due to the pushing of fresh leaves, and to minimize the measurement error of the weight of tea leaves in the whirlpool inside the steamer barrel. ,
Care is taken not to impair the highly accurate steaming time correction measurement.

Further, 90 covers the entire lower surface of the steaming barrel 44, and drains water droplets of steam in the steaming barrel 44 and water during washing, and drains tea stems that have fallen through the mesh of the rotating barrel 48. On the washing board,
To prevent errors in measuring the weight of tea leaves in the vortex passing through the steamer barrel,
It is supported by a base 71.

Reference numeral 91 denotes a highly flexible steam pipe connected between the steam main pipe of the boiler and the steam chamber 47, which will be described later.

Reference numeral 92 denotes a leaf feeder that constantly supplies a constant weight of fresh leaves into the steamer barrel 44, and in this application example, a leaf feeder similar to the leaf feeder shown in FIG. 2 is used. The vibrating gutter serving as the delivery end of the leaf feeder 92 faces the input port 86 of the steamer drum 44, and the delivery end of the vertical packet conveyor faces above the starting end hopper.

Reference numeral 93 includes a flow rate setting device of the leaf feeder 92 and an arithmetic circuit that calculates the current supply amount, and a feed unit that outputs the set target value of the flow rate setting device or the measured current value of the current supply amount to the steaming device control panel, which will be described later. The control panel of the leaf machine 92 is shown.

Reference numerals 94 and 94 are leaf flow sensors arranged slightly above the funnel 87 and facing each other across the width of the funnel. For example, a sensor such as a photoswitch is used to detect fresh leaves from the leaf feeder 92 to the steamer barrel 44. Detect whether or not it is supplied.

95 indicates a boiler. 96 is a burner controller that controls the burn-up of a burner 97 attached to the heating chamber of the boiler 95. When the burn-up of the burner 97 changes, the boiler 95 changes the amount of steam generated and other properties. It is supposed to be done. Reference numeral 98 denotes a steam main pipe that is piped from the steam chamber of the boiler 95 to near the steam chamber 47 of the steam barrel 44, and the above-mentioned flexible steam pipe 91 is connected to the tip of the steam main pipe 98. 99 is a steam amount sensor interposed in a part of the steam main pipe 98, and includes, for example, a float that is moved according to the flow rate of steam passing through the steam main pipe 98, and generates an electrical signal according to the moved position of the float. The amount of steam can be detected by outputting .

Reference numeral 100 indicates a barrel rotation speed control motor that changes the speed of the rotating drum 48 of the steam barrel 44, and 101 indicates a barrel rotation speed sensor that detects the rotation speed of the rotating drum 48. In addition, 102 is a stirring shaft 55
103 shows a stirring shaft rotation speed control motor that changes speed.
shows a stirring shaft rotation speed sensor that detects the stirring shaft 550 rotation speed. 42 is the above-mentioned trunk rotation angle control motor, and 104
is a temporal inclination sensor that detects the inclination of the steam barrel 44.

Reference numeral 105 indicates a control panel of the steaming apparatus of this application example.

FIG. 8 shows an example of the control panel 105. In the figure, 106 is a power switch that can be switched between automatic, manual, and stop, and 107 is a power indicator light, which indicates whether the power is on or not. Reference numeral 108 denotes an operation start and stop switch, which instructs a control circuit, which will be described later, to start and stop a control operation for the steaming apparatus.

109 is a buzzer, for example, the leaf flow sensor 9 described above.
4.94, when it is detected that fresh leaves are not being supplied into the steamer drum 44 from the leaf feeder 92, this buzzer is activated to notify that there is an abnormal state.

A steaming time setting switch 110 is used to set a target steaming time. In this application example, the steaming time level that can be selected and set using the steaming time setting switch 110 is limited to between 20 seconds and 180 seconds.
→ - Each time you press the displayed knob once, the currently set steaming time is increased by 100 seconds, 10 seconds, or 1 second, - Each time you press the displayed knob once 100
It is designed to be decremented at intervals of seconds, 10 seconds, and 1 second, but it is configured so that 20 or less is considered 20 seconds, and 180 or more is considered 180 seconds. Reference numeral 111 is a barrel rotation speed setting volume, which sets the rotation speed of the rotating drum 48 of the steaming drum 44. Reference numeral 112 is a stirring shaft rotation speed setting volume, which sets the rotation speed of the stirring shaft 55. Reference numeral 113 is a barrel side inclination setting volume, which becomes effective only when the power switch 106 is turned on to the manual side, and allows the inclination of the steaming barrel 44 to be manually set.

114 is a steam amount setting volume, which sets the amount of steam supplied from the boiler 95 to the steam chamber 47.

Reference numeral 115 is a zero point update switch, which removes so-called waste other than tea leaves passing through the steamer barrel 44 due to water droplets adhering to the inside and outside of the steamer barrel 44 or tea stems clogging the mesh of the rotating barrel 48. The purpose is to prevent the weight of the steamer from being detected by the displacement detector 79 and causing an error in measuring the steaming time.

When this zero point update switch 115 is pressed, the supply of fresh leaves from the leaf feeder 92 is temporarily interrupted, the inside of the steamer drum 44 is tilted to the lowest state, and this state is held for a while, and the inside of the steamer drum 44 is When all the tea leaves have been discharged, the voltage value indicated by the displacement detector 79 is read into the RAM, and the value read at this time is set as the zero point (Okg) from then on. This is to measure the weight of tea leaves as they pass through the chamber.

116 is a zero point automatic correction switch, and its purpose is almost the same as the zero point update switch 115, but this switch 116 is used at the start of the day's work or when cleaning a rotary cylinder that is clogged with tea leaves. When the rotary cylinder is replaced with a rotary cylinder, the increase in weight of debris, etc. corresponding to the time from the time of startup or replacement is automatically subtracted and the virtual This is a member constituting one aspect of the tea steaming time correction measuring device of the present invention.

Reference numeral 117 is a display device for displaying various current values, and displays the current value of a control element designated by any one of display switches 118a, 118b, 118d, and 118e. That is, 118a is a steaming time display switch, 118b is a temporal slope display switch, 118c is a trunk rotation speed display switch, 1
18d is a stirring shaft rotation speed display switch, and 118e is a steam amount display switch.

Next, FIG. 9 shows an example of a block configuration of a control circuit for controlling the apparatus shown in FIGS. 4 to 8.

In the figure, CPU is a central processing unit. EPROM is a read-only memory that stores control programs for processing,
A relational expression for calculating the steaming time from the calculation program, input data from the control panel 93 of the leaf feeder 92, and measured data, and a relation for zero point correction when the automatic zero point correction switch 116 is pressed. Many formulas etc. are written.

This relational expression is, for example, y = a The results are approximated by a simple formula.

RAM is random access memory.

119 is an input/output port. 108 is the above-mentioned operation start/stop switch, similarly 110 is a steaming time setting switch, 111 is a barrel rotation speed setting volume 112 is a stirring shaft rotation speed setting volume, 113 is a temporal slope setting volume, and 114 is a steam A setting volume, 115 is a zero point update switch, and 116 is a zero point automatic correction switch.

94 is the aforementioned leaf flow sensor, 99 is a steam amount sensor, 101 is a barrel rotation speed sensor, 103 is a stirring shaft rotation speed sensor, 104 is a barrel side inclination sensor, and 79 is a displacement detector. These switches, volumes, detectors 110-111, 112, 113, 114, sensors 94, 99, 101, 103, 104, and detector 79 are connected to a gate circuit 121 which is controlled by a gate/launch control circuit 120.・121・・・・・・
It is connected to the input/output capo (input/output capo) 119 via. Further, 42 is the above-mentioned temporal inclination control motor, and 96 is similarly
is a burner controller, 100 is a drum rotation speed control motor,
102 is a stirring shaft rotation speed control motor, and these are latch circuits 122, 122, etc. controlled by relay RL... and gate launch control circuit 120.
It is connected to the input/output port 119 via.

Therefore, in this application example, the steaming time is corrected and measured.
Control of each control element for indirect automatic control is performed by the first
This is done according to a program as shown in Figure O. This program will be explained below in the order of the numbers assigned to each step.

(al Power switch 10 provided on control panel 105
6 to the automatic side, and the operation start/stop switch 108 to 1.
By pressing twice, a program for indirectly automatically controlling the steaming time is started.

(b) Judgment: "Has the steaming time (steaming time T is hereinafter referred to as t1 to distinguish the set steaming time from the actual steaming time, and the actual steaming time is designated as t2) been set?" Do this.

This is to judge whether or not the desired steaming time has been set using the steaming time setting switch 110. If the steaming time t1 is not set, the next step will not proceed and tl will be set. Wait for it to be set. t
If l has been set, proceed to the next step (C).

(C) A determination is made as to "Have settings been made using each of the other setting volumes?"

This is for determining whether or not the desired settings of the barrel rotation speed, stirring shaft rotation speed, and steam amount have been made using the barrel rotation speed setting volume 111, stirring shaft rotation speed setting volume 112, and steam amount setting volume 114. Unless all settings have been made for each of these volumes, the process waits for all settings to be made without proceeding to the next step.

(dl The voltage value indicated by the displacement detector 79 when the steam barrel 44 is empty at the start is read into the RAM as the zero point.

This is done by reading the weight of the middle support frame 34 that supports the steamer barrel 44, etc. when the tea stems are not clogged or water droplets are not attached, and the subsequent measurement of the tea leaf weight is based on the displacement from this zero point. This is because we are trying to measure it by quantity.

fe) Read the steaming time, drum rotation speed, stirring shaft rotation speed, and steam amount set in steps (b) and (C) above, and read out the corresponding control values. In this apparatus, since the steaming time is controlled by adjusting the inclination of the steaming drum 44, the initial control value of the inclination of the steaming drum 44 corresponding to the set steaming time is read out. In addition, control of each control element such as barrel rotation speed, stirring shaft rotation speed, and steam amount is different from steaming time control, and is set based on your own tea caddy experience and preference, and the control values remain as they are until the set values are changed. As before, you can judge the finish quality of the steamed leaves and adjust the settings to suit your tastes.

(f) Read the current value of each control element.

This uses sensors 104 and 101 to measure the current values of temporal inclination, barrel rotation speed, stirring shaft rotation speed, and steam amount.
- Read by 103 and 99.

(gl Compare each control value read in step te+ above with each current value read in step ffl above. Then, if all the comparison results agree with each other, proceed to step (11) If even one of them does not match, proceed to step (hl).

(hl) For the control elements that did not match the control values in the above step (gl), a control signal corresponding to the compared difference is output to the operating units, that is, the motors 42, 100, 102 or the burner controller 96, and drives those operating units. .Then, steps fel, (f), (g) and (h) are looped until the comparison results match in step (g).

(1) It is determined whether the input command has been output.

This feeding command refers to the supply of fresh leaves to the steamer drum 44 by the leaf feeder 92, and normally, when the comparison result at the step knob (g) is determined to be a match, the leaf feeder 92 is automatically Drive signals are output to the drive system, that is, the drive motor 28, variable speed drive motor 29, and eccentric drive mechanism 32 in FIG. 2, but for some reason the supply of fresh leaves by the leaf feeder 92 is stopped. Alternatively, in the case of interruption, it is necessary to output a feeding command by a step other than the feeding command in step (g) or by other independent means, and when such a special situation occurs, the feed command for fresh leaves to the steamer drum 44 must be output. This step (1) is provided because it is necessary to proceed to the next step after confirming whether or not the supply is being performed.

0) When the closing command is not output in step (1), the drive motor 28, variable speed drive motor 29,
A drive signal is output to the eccentric drive mechanism 32 to drive each conveyor.

When a YES judgment result is obtained in (kl step 0) [Are the leaves flowing? ”.

This is a step to confirm whether fresh leaves are actually being supplied to the steamer drum 44 via the vertical bucket conveyor 27, the crosspiece belt 21, and the vibrating gutter 30.

Vertical bucket soton conveyor 27, belt with crosspiece 21, vibrating gutter 3
0 is being driven, if there are no fresh leaves in the hopper, or if fresh leaves are not being supplied on the path that conveys fresh leaves from the fresh leaf storage room to the vertical bucket conveyor 27, fresh leaves are not supplied to the steamer drum 44. Since it is not present, it is necessary to detect its presence or absence. These detections are made by leaf flow sensors 94, 94.

(1) If it is detected that the leaves are not flowing in the above step (kl), the buzzer 109 is activated to notify the abnormality.

When a YES judgment result is obtained by (ml step +k), a judgment is made as to ``Is the control start point the time amplifier?''.

The judgment referred to here refers to control of the temporal slope, and is a question of whether or not the time to start controlling the temporal slope has timed up. That is, the steaming time is measured by measuring the weight of the tea leaves put into the steaming barrel 44 for each middle support frame 34 that supports the steaming barrel 44, etc.
Until the discharge of steamed leaves from the steaming barrel 44 becomes steady, even if the weight of tea leaves passing through the steaming barrel 44 is measured, it will be an excessive weight. This is because even if the degree of inclination is controlled, it will not be satisfactory, so during this period it is necessary not to measure the weight of the tea leaves passing through the steamer barrel and to control the temporal inclination.

Then, the time that is timed up during this time is, for example, 5
It can be set uniformly, such as minutes, or it can be set individually by giving a margin of some percentage to the set steaming time t1.

fn+ Reads the weight W of tea leaves passing through the steamer barrel 44 based on the amount of displacement from the zero point voltage value of the displacement amount detector 79, and also reads the weight W of tea leaves passing through the steamer barrel 44, and also reads the supply per unit time output from the control panel 93 of the M feeder 92. Quantity setting target value Q1 or measured current value Q2
is read through the input terminal IN.

(0) “Is the automatic zero point correction switch pressed?”
Make this judgment.

Note that this zero point automatic correction switch 116 is automatically released when the -th zero point update control is performed in subsequent steps fu) and (V), and this switch 116
It can also be canceled manually by pressing twice.

(p) If the zero point automatic correction switch 116 is pressed, the weight increase due to adhesion of debris etc. is subtracted, and the step (
Correct the tea leaf weight read with nl.

Note that the weight increase ΔW due to adhesion of debris etc. is expressed, for example, as in the following equation.

ΔW=kx t (Q< t <60
min )ΔW=K (=60k) (t≧60
m1n) Therefore, the correction formula for the weight of tea leaves is W - W - ΔW.

(The time required for the tea leaves to pass through the steamer barrel 44, that is, the measured steaming time t2, is calculated using the formula qlW+Q1 or W+Q2.

(r) The set steaming time t1 and the above step (q
) is compared with the steaming time t2 measured in . If they match, the process proceeds to step (1); if they do not match, the process proceeds to step fsl.

[3] A signal corresponding to the difference compared in step tr> is sent to the operating section, that is, the temporal inclination control section, to drive the temporal inclination control motor 42 and adjust the inclination of the steam barrel 44. As the degree of inclination of the steamer drum 44 increases, the time for tea leaves to pass through the steamer drum is adjusted to become shorter, and conversely, as the degree of inclination of the steamer drum 44 decreases, the time for the tea leaves to pass through the steamer drum is adjusted to become longer. Therefore, the signal output to the temporal inclination control motor 42 is tl
When the difference between the difference between In some cases, a rotation direction command for increasing the inclination of the steam barrel 44 is output. This command is output until the comparison result in step (rl) matches.

(t) It is determined whether the zero point update switch has been pressed.

This is a correction means different from the present invention, and in order to more accurately measure the weight of tea leaves passing through the steamer, the weight after the adhesion of residue to the steamer barrel etc. has become steady. This is to update the zero point due to the increase, and reads the voltage value indicated by the displacement detector 79 after the supply of fresh leaves from the leaf feeder 92 is temporarily interrupted and all the tea leaves passing through the steamer barrel 44 are discharged. , rewrites the original value in RAM using that value as the new zero point.

This command may be input by pressing the zero point update switch 115 provided on the control panel 105, or may be input every time a predetermined period of time, such as two hours, elapses. It's okay to do that. If the zero point update command is not input, the process proceeds to step (w), and if the zero point update command is input, the process proceeds to steps (tll and ().
After executing the control for updating the zero point according to V), the process proceeds to step (W+).

(tll When the zero point update command is input, the supply of fresh leaves by the leaf feeder 92 is stopped, and all the tea leaves in the steamer barrel 44 are discharged. In reality, the tea leaves in the steamer barrel 44 are discharged. Isn't this done by special means of evacuation?
This is done by increasing the inclination of the steamer barrel 44 to the maximum and counting the elapsed time (for example, 2 minutes) required to complete the discharge.

The voltage value previously recognized and stored as the zero point written in the MRAM is cleared and rewritten to the voltage value of the displacement detector 79 measured after the discharge.

←) Make a judgment as to whether the settings of each setting device have been changed.

For example, this may occur if the quality of fresh leaves supplied from the fresh leaf storage room changes, or if the originally set steaming time or barrel rotation speed changes.
Depending on the stirring shaft rotation speed and steam volume, if the steamed leaves of the expected quality are not obtained, the setting switch and volume may be changed immediately according to the tea caddy's preference, and if these settings are changed, the step It is necessary to redo the control of each control element adjusted in (111) to (hl. Therefore, if any of the set values is changed, step te
Return to step 1 and continue measuring the steaming time and controlling the temporal slope.

Effects of the Invention As is clear from the above description, the tea steaming time correction measuring method of the present invention calculates the weight of tea leaves passing through the steamer barrel by weighing the frame supporting the steamer barrel, and To set the supply amount per unit time of the leaf feeder that supplies fresh leaves into the steamer barrel, or measure the actual supply amount per unit time, and calculate the tea leaves Hl passing through the steamer barrel. is calculated by subtracting the predicted amount of debris adhesion at that point from the value measured for each frame supporting the steamer barrel, and correcting the error due to the gradual increase in deposits on the steamer barrel etc. over time. The present invention is characterized in that the time required for the tea leaves to pass through the steamer barrel is calculated by dividing the weight of the tea leaves by the set or measured amount of supply per unit time.

In addition, the tea steaming time correction measuring device of the present invention includes means for weighing the weight of tea leaves passing through the steamer barrel together with a frame that supports the steamer barrel, and a unit time of a leaf feeder that supplies fresh leaves into the steamer barrel. A means for setting a target value of the supply amount per unit time or a means for measuring the current value of the supply amount per unit time, and a total weight of tea leaves obtained for each frame supporting the steamer barrel to predict the adhesion of dregs at the relevant time. The present invention is characterized by comprising an arithmetic circuit that calculates the tea leaf weight by subtracting the amount and then divides the tea leaf weight by a set target value or measured current value of the supply amount per unit time.

Therefore, according to the present invention, the steaming time of tea leaves that are continuously passed through the steamer barrel can be measured almost continuously, and there is almost no time lag between the passage of tea leaves and the measurement. , the steaming time at that time can be measured very accurately by correcting errors due to debris adhering to the steamer barrel at that time, in accordance with the actual situation. Then, by comparing the steaming time measured by the present invention with the desired steaming time and controlling the control elements related to the steaming time according to the comparison result, the tea leaves can be steamed for the desired steaming time. be able to.

[Brief explanation of drawings]

Fig. 1 is a schematic side view for explaining the basic principle of tea steaming time measurement according to the present invention, and Fig. 2 is a schematic side view for explaining the basic principle of tea steaming time measurement according to the present invention. A schematic side view for explaining the control method and the principle of the device,
Figure 3 is a block diagram showing an example of the control circuit.
10 to 10 show a specific example of a tea steaming apparatus in which the steaming time is controlled using the steaming time correction measuring method of the present invention, and FIG. 4 is a schematic plan view showing the entire steaming apparatus, and FIG. Figure 5 is a plan view of the steamer main body without mainly showing what is attached to the inner frame support frame, Figure 6 is a front view of the steamer main body, and Figure 7 is an example of the operating section, with only the main parts taken out. 8 is a front view showing an example of a control panel, FIG. 9 is a block diagram showing an example of a control circuit, FIG. 10 is a flowchart showing an example of a program, and FIG. 11 is a conventional tea steaming device. FIG. CPU-EPROM-RAM...Arithmetic circuit 1/44
...Steaming barrel 2.46...Fixed barrel 3.48...Rotating barrel 8.79...Displacement detector 11.92...Leaf feeder 34...Inner frame support frame 35.・Middle frame 71・・
・Base Figure 7

Claims (2)

[Claims] (1) The weight of the tea leaves passing through the steamer drum is determined by weighing the frame that supports the steamer drum, and on the other hand, the supply amount per unit time of the leaf feeder that supplies fresh leaves into the steamer drum is set. Alternatively, when measuring the actual supply amount per unit time and determining the weight of tea leaves passing through the steamer barrel, predict the adhesion of dregs at that point from the weighed value of the frame supporting the steamer barrel. The amount of tea leaves is subtracted to correct the error caused by the gradual increase in adhesion of residue to the steamer barrel etc., and the weight of the tea leaves obtained by this correction is divided by the set or measured amount of tea leaves supplied per unit time. A method for correcting and measuring tea steaming time, which is characterized by calculating the passage time in a steaming barrel. (2) Setting a means for measuring the weight of tea leaves passing through the steamer drum, including the frame that supports the steamer drum, and a target value for the supply amount per unit time of the leaf feeder that supplies fresh leaves into the steamer drum. or means for measuring the current value of the supply amount per unit time;
After subtracting and correcting the weight of the tea leaves obtained by weighing the frame that supports the steamer drum by the predicted amount of residue adhesion at that point in time, this tea leaf weight is calculated as the set target value or the measured current value of the supply amount per unit time. A tea steaming time correction measuring device characterized by comprising an arithmetic circuit that divides by .