JPH02293835A - Film carrier - Google Patents

Abstract

PURPOSE:To prevent damage to a film and injury to an operator by detecting the completion of film take-up when the ratio of the rotational amount, which a roller rotation detecting means detects, to the rotational amount, which a driving shaft rotation detecting means detects, stops decreasing or increasing, and stopping the rotation of a driving shaft. CONSTITUTION:A supply shaft 2 is provided with an encoder E1 as the driving shaft rotation detecting means for detecting the rotational amount of the supply shaft; the rotary shaft of a guide roller 7 is provided with an encoder E2 as the roller rotation detecting means for detecting the rotational amount of the rotary shaft; a take-up shaft 3 is provided with an encoder E3; each encoder is connected to a control circuit 5 to detect the rotational amount and a rotating direction. A film is judged to be completely taken up when C2/C1 stops decreasing or increasing; here, C1 and C2 represent the rotational amount of the driving shaft 2 and the rotational amount of a film carry detecting roller 7, respectively. Consequently, the completion of film take-up is securely detected, and the rotation of the driving shaft is stopped. Thus, injury to an operator body and damage to a film can be prevented.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention, for example, rotates a supply shaft to wind up a roll of film onto the supply shaft, and when the entire film is wound up on the supply shaft, an automatic This paper relates to a film transport device equipped with an automatic stop mechanism that stops the rotation of the supply shaft automatically. (Prior Art) Conventionally, this type of film transport device has been used in, for example, microfilm readers and league printers. This device includes a supply shaft to which a roll of film wound around a supply reel is attached, and a take-up shaft to which a take-up reel is attached to wind the film from the supply reel via a conveyance path. The motor that rotates the take-up shaft is connected to the control circuit. Additionally, a controller is connected to the control circuit, which allows the operator to control the transport of the film. In this device, after the film wound around the supply reel passes through the transport path and is wound around the take-up reel, the operator operates the controller to rotate the supply shaft or the take-up shaft to move the film along the transport path. Transport in any direction inside.
When the film is to be rewound onto the supply shaft, the supply shaft is rotated to wind the film and the motor that rotates the take-up shaft is stopped. As a result, the film taken up on the take-up reel is rewound onto the supply reel, and the take-up shaft and take-up reel rotate following the film. Further, a guide roller for transporting the film is provided in the transport path, but when the film is rewound, the drive of this guide roller by the motor is stopped and the guide roller rotates following the film. When all the film has been rewound onto the supply reel, the control circuit detects the end of rewinding and stops the rotation of the supply shaft. As a method for detecting the end of rewinding in the control circuit, for example, a method using an encoder is adopted. This method uses the output pulses of an encoder installed on the supply shaft and an encoder (
Detects the output pulses of the comparison encoder (hereinafter referred to as comparison encoder),
For example, when the encoder on the supply shaft rotates and generates pulses, and the comparison encoder stops rotating and no longer generates pulses, it is determined that rewinding has ended. (Problem to be solved by the invention) However, since the rotational resistance of the guide roller and take-up shaft is small, even after the film has been completely rewound onto the supply shaft, they continue to rotate for a while due to inertia, and even after the rewind is finished, It takes time for the rotation to stop. Therefore, in the above-mentioned conventional technology, pulses continue to be generated from the comparison encoder for a while after the rewinding is finished, and during that time, the feeding shaft continues to rotate, and the winding is wound around the feeding shaft. The tip of the film is swung around. As a result, there was a problem in that the leading edge of the film often collided with surrounding components, causing damage to the film, and the operator could be injured by the tip of the film being swung around. In addition, if it is determined that rewinding has finished when the rotational speed of the comparison encoder decreases, the rotational speed of the comparison encoder is likely to change due to fluctuations in the moving speed of the film due to the rotation of the supply shaft, etc., so the judgment may be incorrect. often occurs. In order to prevent erroneous judgments, if it is determined that rewinding has ended when the rotational speed of the comparison encoder has significantly decreased, then in the same way as the method described above, from the end of rewinding until the end of rewinding is detected. This will take time. In order to solve this problem, a method has been considered in which a sensor is installed on the conveyance path and this sensor detects the presence or absence of film on the conveyance path to detect the end of rewinding. When loading the film wound on a reel by winding it around the take-up shaft via the conveyance path,
There is a problem that the sensor gets in the way, and there is also the disadvantage that the cost is high because it uses a sensor. The present invention has been made to solve the problems of the prior art described above, and its purpose is to quickly and reliably detect the end of film winding, stop the rotation of the drive shaft, and The object of the present invention is to provide a film transport device that can prevent injury to the operator. (Means for Solving the Problems) In order to achieve the above object, in the present invention, the film is conveyed by winding the roll film around the drive shaft by rotating the drive shaft, and the film is transported by rotating the drive shaft. A film conveying device that automatically stops the rotation of the drive shaft when the entire film is wound onto the drive shaft, further comprising: a drive shaft rotation detection means for detecting the amount of rotation of the drive shaft; A film conveyance detection roller that rotates as the film moves, and a roller rotation detection means that detects the amount of rotation of this roller, and the amount of rotation detected by the roller rotation detection means and the rotation amount detected by the drive shaft rotation detection means are detected. The invention is characterized in that the end of film winding is detected and the rotation of the drive shaft is stopped when the ratio to the amount of rotation decreased or stopped increasing. (Function) In the apparatus of the present invention having the above configuration, if the amount of rotation of the drive shaft is CI and the amount of rotation of the film conveyance detection roller is C2, when the film is wound on this drive shaft, As the diameter of the rolled film increases, the speed of movement of the film increases relative to the rotation speed of the drive shaft, and the amount of rotation of the film conveyance detection roller that contacts the film increases accordingly. Therefore, C2/CI increases with time until the winding of the film is completed. Furthermore, when winding of the film is completed, the film separates from the film transport detection roller, and this roller continues to rotate due to inertia, but the amount of rotation decreases with time. Therefore, after winding is completed, C2/
CI decreases. The above-mentioned change in C2/CI is not caused by uneven rotation of the drive shaft or fluctuations in film moving speed, so in the device of the present invention, when C2/C1 decreases or stops increasing, the film changes. By determining that winding has finished, it is possible to reliably detect the end of winding and stop the rotation of the drive shaft. (Example) The present invention will be explained below according to the illustrated example. 1st
The figure is an explanatory diagram showing the configuration of a film conveying device according to an embodiment of the present invention. In the figure, this film transport device 1 includes a supply vehicle 2 equipped with a supply reel 2a wound with a roll-shaped microfilm F, and a winding reel 3a equipped with a winding reel 3a for winding the film F from the supply reel 2a. Take shaft 3
A motor M1 for rotating the supply shaft 2 is provided.
, a motor M2 for rotating the take-up shaft 3, and a controller 4 for controlling the conveyance of the film are connected to a control circuit 5.
It is connected to the. A conveyance path 6 is provided between the supply shaft 2 and the take-up shaft 3, and this conveyance path 6 is connected to a pair of guide rotors 7, 8 . A pair of film guides 9, 10, a pair of film pressure plate glass 1
1, 12, yet another pair of film guides 13.14
Consists of. Further, a guide roller l5 and a guide arm l6 are installed on the take-up shaft side of this conveyance path 6, and the supply reel 2
The film F fed from a is guided to a take-up reel 3a. That is, the guide arm l6 is rotatably supported at one end l7, biased toward the take-up reel 3a by a spring l8, and guided by a guide roller l provided at the other end.
9 is pressed against the core 3b of the take-up reel, and the tip of the film F is moved between the guide roller 19 and the core 3 by a portion forming an arc from the end of the conveyance path 6 toward the guide roller 19.
I will guide you during b. The supply shaft 2 is driven to rotate counterclockwise by a motor M when rewinding the film, and the take-up shaft 3 is driven to rotate counterclockwise by a motor M2 when winding the film F. The guide roller 7 is driven by a loading motor (not shown), a motor M+, or a motor M2 (not shown) via a drive mechanism (not shown), and the guide roller 7 functions as a film transport detection roller that rotates as the film moves during film rewinding. Play a role. The supply shaft 2 includes an encoder E1 as a drive shaft rotation detection means for detecting the amount of rotation of the supply shaft, and a guide roller 7.
The rotating shaft is provided with an encoder E2 as a roller rotation detection means for detecting the amount of rotation of this rotating shaft, and the winding shaft 3 is provided with an encoder E3, each of which is connected to the control circuit 5 to detect the amount and direction of rotation. It will be done. The control circuit 5 is controlled by a controller 4, which, as shown in FIG. A semi-auto load start switch 22 for automatically loading the leading end of the film into the transport path 6 and winding it around the take-up reel 3a, and a display 2 for displaying the amount of film to be transported, etc.
It has 3. In this device, when transporting film F,
The operator attaches the film F wound on the supply reel 2a to the supply shaft 2, and inserts the tip of the film JAF into the guide roller 7.8.
By sandwiching the film F between them and pressing the semi-auto load start switch 22, the guide roller 7 rotates and sends the leading edge of the film F to the transport path 6. Then, this film F is sent to the take-up reel 3a through the transport path 6, and automatic loading ends when the leading end of the film F is wound around the take-up reel 3a. Thereafter, the operator rotates the control knob 2l in the a direction or the b direction shown in FIG. 2, so that the film F is transported in an arbitrary direction within the transport path 6 (left and right directions in FIG. 1). When rewinding the film F onto the supply reel 2a, the operator rotates the control knob 2l in the unwinding direction, thereby rotating the rewinding shaft 3. The rotation of the guide roller 7 is stopped, and the supply shaft 2 is rotated by the motor Ml to rewind the film F. Then, all the film F is on the supply reel 2a.
The end of unwinding is detected when the feed is wound up, and the rotation of the supply shaft is stopped. FIG. 3 is a flowchart showing the operation of the control circuit 5 during film rewinding. In the figure, first, the control circuit 5
, clear variable A (step ■), and set the number of pulses e1 generated by encoder E1 and encoder E2 during a predetermined time.
, e2 (steps ■, ■). Then, compare the pulse ratio e2/e1 with variable A (step ■),
62/el>A, set the value of variable A to e2/e+ (step ■), and return to step ■. This operation is repeated, and when e2/e+≦A, it is determined that the rewinding is completed, and the drive of the motor MI is stopped to stop the rotation of the supply shaft 2 (step ■). Here, as shown in FIG. 4, as the diameter of the film F wound on the supply reel 2a (winding diameter of the supply reel 2a) increases, the drive rotational speed of the supply shaft remains constant, so the film F is transported. As the travel speed in path 6 increases, the pulse ratio e+/61 increases. Then, when the film rewinding is completed, the film F separates from the guide roller 7, and from then on, the amount of rotation of the guide roller 7, that is, the number of pulses 02 of the encoder E2 continues to decrease, so that the pulse ratio e2/el also continues to decrease. Figure 5(a). (b)
．． (c) is the number of pulses el, the number of pulses e2,
It is a diagram showing temporal changes in the pulse ratio e2/el, in which solid lines a, b, and c represent changes in measured values when the supply shaft 2 is rotating at a substantially constant speed, and dotted lines a,
', c' indicate changes in measured values when there is rotational unevenness in the supply shaft 2, and tl
indicates the point at which film F has finished rewinding. As can be seen from the figure, the number of pulses 82 varies greatly when the supply shaft 2 has uneven rotation, and when e2≦02 in Figure 5 (b) using the conventional method, the rewinding is completed. If it is determined that the rewinding has ended, it is necessary to falsely detect the end of rewinding at time t2, or to wait until t
The end of rewinding is not detected until point 3.
However, in this embodiment, the pulse ratio e2/el remains constant at the end of rewinding, regardless of the rotational speed of the supply shaft 2. Since it changes from increase to decrease after I, the end of rewinding can be reliably detected regardless of uneven rotation of the supply shaft 2, fluctuations in the moving speed of the film F, or the winding diameter of the microfilm reel. In this embodiment, an example is taken of a device that uses a guide roller as a film conveyance detection roller, a supply shaft as a drive shaft, and detects the amount of rotation by an encoder. However, the present invention is not limited to this. For example, in the apparatus of this embodiment, a take-up reel may be used as the film conveyance detection roller, an encoder E3 may be used as the roller rotation detection means, and a take-up shaft may be used as the drive shaft to wind the film around the take-up shaft. Furthermore, a tacho generator or the like may be used instead of an encoder as the rotation amount detection means. (Effects of the Invention) The present invention has the configuration and operation described above, and can quickly and reliably detect the end of film winding and stop the rotation of the drive shaft, thereby preventing injury to the film operator. Can be done. Furthermore, in the apparatus of the present invention, since there is no need to provide a sensor on the film transport path, the cost is low and there is no problem in loading the film.

[Brief explanation of drawings]

Figures 1 to 5 are diagrams showing embodiments of the present invention.
Figure 2 is an explanatory diagram showing the configuration of the film transport device, Figure 2 is an explanatory diagram showing the controller in detail, Figure 3 is a flowchart showing the operation of the control circuit, and Figure 4 is the pulse ratio of the encoder and the supply reel. Figure 5 (a) shows the relationship between the winding diameter and the winding diameter.
) is a diagram showing the temporal change in the number of pulses of the encoder of the supply shaft, (b) is a diagram showing the temporal change of the pulse number of the encoder of the guide roller, and (c) is a diagram showing the temporal change of the pulse ratio of the encoder. FIG. Explanation of symbols l... Film transport device 2... Supply shaft (drive shaft) 3... Winding shaft 4... Controller 5...
・Control circuit 7... Guide roller E1... Encoder E2... Encoder E3... Encoder 6... Conveyance path (film conveyance detection roller) (Drive shaft rotation detection means) (Roller rotation detection means) F ...Microfilm Section J, Section 3, Section 2? ■Yabetsu Mochi, a type of dog-boiled rice cake

Claims (1)

[Claims] By rotating the drive shaft, a roll of film is wound around the drive shaft to transport the film, and when the entire film is wound around the drive shaft, the drive shaft is automatically rotated. A film conveyance device for stopping the drive wheel, comprising: a drive wheel rotation detection means for detecting the amount of rotation of the drive shaft; a film conveyance detection roller that comes into contact with the conveyed film and rotates as the film moves; and a rotation amount of the roller. and roller rotation detection means for detecting the film, when the ratio of the rotation amount detected by the roller rotation detection means to the rotation amount detected by the drive wheel rotation detection means decreases or stops increasing. 1. A film conveying device, characterized in that the rotation of the drive shaft is stopped upon detecting the end of winding of the film.