JPS63143132A - Paper sheets supplier - Google Patents

Abstract

PURPOSE:To omit waste of supply time, by switching a processing speed mode and controlling an inverter and rotary speed of a driving motor by an output of photoelectric sensors provided in a position of predetermined height in a supply part where paper sheets of every length is mixed existing. CONSTITUTION:Paper sheets, for instance, an envelope 10 and a postcard 11 in every length are fed from a supply part 9, being detected and discriminated by photoelectric sensors 8, 8 provided in a predetermined position of predetermined height. The paper sheets 10, 11, whose length is detected, are attractively attached by a suction belt 7 being supplied sheet by sheet to a conveying line 15. The suction belt 7, which forms holes to be drilled in a fixed space, attractively attaches the paper sheets by a negative pressure in a main chamber 2 in the reverse side of the belt 7. A subchamber 5 attractively attaches the next paper sheet to be prevented from its double feed. An output of the photoelectric sensors 8 switches a processing speed mode to high and low levels, switching an output frequency of an inverter and a speed of a driving motor. In this way, processing efficiency improves simplifying constitution.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a paper sheet feeding device for feeding paper sheets to a processing machine that processes paper sheets of various sizes, such as mail items. In particular, the present invention relates to a suction belt type paper sheet feeding device.

[Conventional technology]

Conventionally, this type of paper sheet feeding device has a configuration as shown in FIG. That is, paper sheets 1 placed in the feeding device are passed in front of a main chamber 2 connected to a negative pressure air source (not shown) such as a blower with a hose by a suction belt 3 driven in the six directions of arrows. They are picked up one by one, transported, and supplied to the downstream transport system 4. A plurality of holes are provided in the front surface of the main chamber 2, while holes are provided in the suction belt 3 at regular intervals. When the suction belt 3 is driven in the direction of the arrow A and these two holes coincide, the paper sheet 1 that is closest to the paper sheet that is in contact with the suction belt 3 is attracted and conveyed. At this time, the subchamber 5, which is connected to the same negative pressure air source with a hose, prevents two sheets 1 from being sent out at the same time by sucking and holding the lower end of the second sheet 1. do. As the paper sheets 1 are sent out one by one, the fork 6 is driven to move the paper sheets 1 to the left in order to replenish the next sheet in front of the suction belt 3.

[Problem that the invention seeks to solve]

In the conventional paper sheet feeding device as described above, the suction belt 3 is driven at a constant speed, and the conveyance pitch of the paper sheets is determined by the interval between the holes provided in the suction belt 3. The feeding speed remains constant regardless of the length of the paper sheets being fed. In other words, the conveyance pitch is a constant pitch. On the other hand, paper sheets such as mail have various sizes, such as lengths in the longitudinal direction ranging from 140 mm to 235 mm. For this reason, the feeding device must set a conveyance pinch that takes into account the longest paper sheet within a specified range. Therefore, when handling short paper sheets, the conveyance pitch becomes longer relative to the paper sheets, which has the disadvantage that the processing efficiency deteriorates accordingly. As a means to solve this drawback, a paper sheet feeding device ( For example, there is Japanese Utility Model Application No. 58-144545>.However, this method requires a servo motor and a complicated control device, so it is unsuitable for inexpensive T!! machines.Also, as another method, For example, when processing only short paper sheets such as New Year's postcards, there is also a method that uses a manual changeover switch to vary the processing speed.However, with this method, the operator has to manually switch There is the inconvenience of having to make a judgment and operate the changeover switch.

The purpose of the present invention is to eliminate the drawbacks of the conventional paper sheet feeding device as described above, and to supply paper sheets that are inexpensive, have excellent processing efficiency, and are easy to handle since there is no need to operate a changeover switch. The goal is to provide equipment.

[Means for solving problems]

The paper sheet feeding device of the present invention picks up sheets one by one on a suction belt from a supply section loaded with six sheets of various lengths and sends them to a conveyance system disposed downstream. In the leaf supply device, a photoelectric sensor set at a predetermined height at a predetermined position in front of the suction belt; a mode switching section that sends out a processing speed mode switching signal in response to a signal from the photoelectric sensor; The apparatus includes an inverter section that changes the frequency according to a signal from the mode switching section, and a drive motor that is supplied with AC power from the inverter section and rotates to drive the suction belt.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, and FIGS. 2 and 3 are a front view and a plan view showing an overview of the mechanism of the embodiment of FIG. 1.

In this embodiment, a certain distance (e.g., 50 mm) in front of the suction belt 7 and a certain height, e.g., 18
A photoelectric sensor 8 is provided at a position (0 mm). If there is an object with a length exceeding the predetermined height of 180 mm in front of the suction belt 7 of the supply section 9, for example, an envelope (length 205 mm) 10, the optical path of the photoelectric sensor 8 is blocked. The state becomes “OFF”. For example, if there are only postcards 11 (length 148 mm) whose length is smaller than the predetermined height (180 mm),
The photoelectric sensor 8 is in the "ON" state because its optical path is not blocked. A signal indicating “ON” or “OFF” of the photoelectric sensor 8 is sent to the mode switching unit 12.
2 is the normal mode signal when the signal is “OFF”, and the signal is “ON”.
” signal, a high-speed mode signal is sent to the inverter section 13.

In the inverter section 13, an AC drive current (with a frequency of 50 Hz when receiving the normal mode signal from the mode switching section 12 and a frequency of 65 Hz when receiving the high speed mode signal)
200V) is supplied to the drive motor 14 of the suction belt 7. Therefore, the suction belt 7 is
If the drive system has its roller and bobber diameter set to have a processing speed of 0.000 letters/hour, then in high speed mode it will be driven at 65150 or 1.3 times the speed. The processing speed is 45,000 messages/hour. On the other hand, the conveyance system 15 located above the suction belt 7 is set to match the conveyance speed when the suction belt 7 is in the high speed mode.

Therefore, in the conveyance system after the supply section, the conveyance speed of paper sheets is the same in both normal mode and high speed mode, and subsequent processing operations such as stamp stamping on mail are not controlled. It has no effect.

The above-mentioned switching of the processing speed between the normal mode and the high-speed mode allows the paper sheets in front of the suction belt 7 to be processed in one group even when a mixture of paper sheets of various lengths is fed. It is possible to detect the length and switch between both modes continuously and automatically.

〔Effect of the invention〕

As explained above, the present invention detects the length of paper sheets in front of the suction belt as a small group, and switches the feeding speed of the suction belt, thereby using a simple mechanism and control section. This has the effect of providing a paper sheet feeding device that is relatively inexpensive and has high processing efficiency.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, FIGS. 2 and 3 are front and plan views showing an outline of the mechanism of the embodiment of FIG. 1, and FIG. 4 is a conventional FIG. 3 is a front view showing an example of a mechanism section of the paper sheet feeding device. 1...paper sheets, 2...main chamber, 3.7...
・Suction belt, 4・15... Conveyance system, 5...
Sub-chamber, 6... Fork, 8... Photoelectric sensor, 9... Supply section, 10... Envelope, 11... Postcard, 12... Mode switching section, 13... Inverter section,
14... Drive motor, 1-111

Claims (1)

[Claims] In a paper sheet feeding device that picks up sheets of paper sheets of various lengths one by one from a feeding unit loaded onto a suction belt and sends them out to a conveyance system disposed downstream of the suction belt, in front of the suction belt. a photoelectric sensor set at a predetermined height at a predetermined position of the photoelectric sensor; a mode switching section that sends out a processing speed mode switching signal in response to a signal from the photoelectric sensor; A paper sheet feeding device comprising: an inverter section for changing the suction belt; and a drive motor that is supplied with alternating current power from the inverter section and rotates to drive the suction belt.