JPS6253872A - Ink quantity detector for rotary stencil duplicator - Google Patents

Abstract

PURPOSE:To enable a predetermined quantity of an ink to be automatically supplied, by operating an ink-supplying device through detecting variations in the rotating frequency of ink quantity detecting rollers each of which is pressed against a form cylinder through an ink layer. CONSTITUTION:When the quantity of an ink on the form cylinders 1, 1' is decreased with the progress of printing and the frictional resistance on the form cylinders is increased, the rotating frequency of ink quantity detecting rollers 2, 2' is increased, and becomes higher than that of a disk 11. A projected part 23 of a disk 22 connected direct to the roller 2 comes into contact with a tip part of a detecting pawl 16 of a detecting disk 12, pushes away the pawl 16 to slide the disk 12 outward along a shaft 8, and comes into contact with a fastening piece 15 of the disk 11, whereas a detecting lever 17 is pivotally moved about a pivotal shaft through a detecting roller 18. This motion of the lever 17 is transmitted to an operating lever in an operating mechanism of a pump, and an ink is supplied to the form cylinders 1, 1'.

Description

【発明の詳細な説明】 産業上の利用分野 この発明は輪転謄写機のインキ量検出装置に関するもの
である。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to an ink amount detection device for a rotary copying machine.

従来の技術 一般に、インキチューブからポンプによりインキが印刷
版胴に供給されるようになった輪転謄写機において、印
刷版胴へのインキの補給を行うには印刷物の印刷状況を
みながらインキ補給キーやスイッチ等を押しポンプを作
動して印刷版胴にインキを補給したり、或は印刷物の印
刷枚数に応じて所定枚数印刷したときに定期的にインキ
を補給したり、またインキ量検知ローラの回転数の変動
を速度発電機を介して比較回路等により電気的に制御し
てインキを補給するものが知られている。Conventional technology Generally, in rotary copying machines in which ink is supplied from an ink tube to a printing plate cylinder by a pump, ink is supplied to the printing plate cylinder by pressing the ink supply key while checking the printing status of the printed material. You can replenish ink to the printing plate cylinder by pressing a button or switch to activate the pump, or periodically replenish ink when a predetermined number of sheets have been printed depending on the number of printed materials, or by operating the ink amount detection roller. It is known to replenish ink by electrically controlling fluctuations in rotational speed using a comparison circuit or the like via a speed generator.

発明が解決しようとする問題点 しかし乍ら、この様に印刷物の印刷状況や印刷枚数に応
じてインキを補給するのは印刷状態が一定にならず面倒
で厄介であり、また電気的制御機構を用いるものは犬が
＼りで複雑な構成となり、高価につく等の欠点がみられ
る。Problems to be Solved by the Invention However, replenishing ink according to the printing conditions and the number of prints is troublesome and cumbersome because the printing conditions are not constant, and it also requires an electrical control mechanism. The devices used have drawbacks such as the presence of dogs, complicated structures, and high prices.

従って、この発明の目的はこの様な従来における問題点
を解決するために、印刷版胴にインキ層を介して圧接さ
れるインキ量検知ローラの、印刷版胴に対する回転数の
変化を比較検出し、これによりインキ供給装置を作動し
てインキを供給するようにした簡単な構成の輪転謄写機
の、インキ量検出装置を提供することにある。Therefore, an object of the present invention is to solve these conventional problems by comparing and detecting changes in the rotational speed of an ink amount detection roller that is pressed against the printing plate cylinder through an ink layer with respect to the printing plate cylinder. It is an object of the present invention to provide an ink amount detection device for a rotary copying machine having a simple structure, which operates an ink supply device to supply ink.

問題点を解決するための手段 上述のこの発明の目的を達成するために、この発明に従
って構成された輪転謄写機のインキ量検出装置は、イン
キ供給装置によりインキが印刷版胴に供給される輪転謄
写機において、印刷版胴の外周面にインキ層を介して圧
接されインキ量に応じて印刷版胴に対する回転数が変化
するインキ量検知ローラ軸端に設けられ周辺から放射方
向に部分的に突出する突出部を有した小径の第１のディ
スク、印刷版胴軸から伝動機構を介して予め設定された
一定回転数で回転されるよう該小ディスクと同軸上に隣
接して設けられて該突出部に対応する切欠窓と該突出部
と係合すべく内側に屈曲された係止片を有する大径の第
２のディスク、第２のディスクと同軸に軸方向に滑動可
能に設けられ第１，２の両ディスクの回転数の相違に応
じて両ディスクを連結する検出づめを有した検出ディス
ク、検出ディスクの表面に接触する検出コロを一端に有
した枢動可能な検出レバー、該検出レバーを介して作動
されるようになったインキ供給装置の作動機構のための
作動レバーを備えている。Means for Solving the Problems In order to achieve the above-mentioned object of the present invention, an ink amount detection device for a rotary copying machine constructed according to the present invention is applicable to a rotary copying machine in which ink is supplied to a printing plate cylinder by an ink supply device. In a mimeograph machine, an ink amount detection roller that is pressed against the outer peripheral surface of the printing plate cylinder via an ink layer and whose rotation speed relative to the printing plate cylinder changes depending on the amount of ink is installed at the shaft end and partially protrudes from the periphery in the radial direction. a small-diameter first disk having a protrusion that rotates from the printing plate cylinder shaft via a transmission mechanism at a preset constant rotation speed; a large-diameter second disk having a notched window corresponding to the part and a locking piece bent inward to engage with the protruding part; , a detection disk having a detection pawl that connects both disks according to the difference in rotational speed of the two disks, a pivotable detection lever having a detection roller at one end that contacts the surface of the detection disk, and the detection lever. It is provided with an actuating lever for the actuating mechanism of the ink supply device which is actuated via the ink feeder.

この発明の他の目的と特長および利点は以下の添付図面
に沿っての詳細な説明により明らかになろう。Other objects, features and advantages of the present invention will become apparent from the following detailed description taken in conjunction with the accompanying drawings.

実施例 図面の第１図乃至第６図にはこの発明のインキ量検出装
置が実施された輪転謄写機での一実施例が示され、印刷
版胴１，１１に対して一対のインキ量検知ローラ２，２
“がインキ層を介して圧接されており、これら印刷版胴
１，１１の１つすなわち印刷版胴１と、インキ景検知ロ
ーラ２゜２１の１つすなわちインキ量検知ローラ２との
間の回転数の比の変化を検出するよう構成されている。Embodiment FIGS. 1 to 6 show an embodiment of a rotary copying machine in which the ink amount detection device of the present invention is implemented, and a pair of ink amount detection devices are installed for printing plate cylinders 1 and 11. rollers 2, 2
" are pressed together through an ink layer, and the rotation between one of the printing plate cylinders 1 and 11, that is, the printing plate cylinder 1, and one of the ink image detection rollers 2 and 21, that is, the ink amount detection roller 2. The apparatus is configured to detect a change in the ratio of numbers.

また、本実施例ではインキ量検知ローラはインキ練ロー
ラを兼用している。先ず、電動機（図示しない）により
一定の速度で定常的に駆動される印刷版胴１と同軸に設
けられたプーリ３からベルト４、二段プーリ５およびベ
ルト６を介して一定の基準回転数に減速して駆動される
駆動側のプーリ７が設けられる。このプーリ７はインキ
量検知ローラ２と同軸線上に設けられた軸８に固着され
、軸８の軸端にディスク１１が固着されると共に軸８に
沿って滑動可能に検出ディスク１２が設けられている。Further, in this embodiment, the ink amount detection roller also serves as an ink mixing roller. First, a pulley 3 provided coaxially with the printing plate cylinder 1, which is driven steadily at a constant speed by an electric motor (not shown), reaches a constant reference rotational speed via a belt 4, a two-stage pulley 5, and a belt 6. A drive-side pulley 7 that is driven at reduced speed is provided. This pulley 7 is fixed to a shaft 8 provided on the same axis as the ink amount detection roller 2, and a disk 11 is fixed to the end of the shaft 8, and a detection disk 12 is provided so as to be slidable along the shaft 8. There is.

軸８の端部に固着されたディスク１１には欠切窓１４が
設けられると共に、この切欠窓１４を形成するためにデ
ィスク１１の切欠窓相当部分を内側に折曲げて係止片１
５が設けられる。また、軸８に沿って滑動可能に設けら
れた検出ディスク１２の内側周辺にはディスク１１の切
欠窓１４から内側に突出するよう検出づめ１６が設けら
れている。更に、検出ディスク１２の外側の外周面には
検出レバー１７の一端に設けられた検出コロ１８が接触
している。検出レバー１７は中はどで枢支され、ばね１
９により検出コロ１８が検出ディスク１２に常に接触し
ているように引張っている。A cutout window 14 is provided on the disk 11 fixed to the end of the shaft 8, and in order to form the cutout window 14, a portion of the disk 11 corresponding to the cutout window is bent inward to form the locking piece 1.
5 is provided. Further, a detection pawl 16 is provided around the inner side of the detection disk 12 which is slidably provided along the shaft 8 so as to protrude inwardly from the cutout window 14 of the disk 11. Furthermore, a detection roller 18 provided at one end of the detection lever 17 is in contact with the outer peripheral surface of the detection disk 12 . The detection lever 17 is pivoted at its center and is supported by a spring 1.
9 pulls the detection roller 18 so that it is always in contact with the detection disk 12.

この様な駆動側のディスク１１に対応してインキ量検知
ローラ２の軸２１の端部に小径のディスク２２が固着さ
れている。このディスク２２は第３Ａ図に明示されるよ
うにディスク１１よりも小径で、放射方向外方に突出す
る突出部２３が設けられており、インキ量検知ローラ２
の速度にもとづいてこの突出部２３がディスク１１の係
止片１５と係合したり検出づめ１６が載置したりできる
ようになっている。特に、ディスク２２の突出部２３は
検出づめ１６の先端が載置し易い様に第６Ｃ図に示され
る如く先端縁が内側に折曲げ傾斜している。なお、駆動
側のディスク１１の基準速度比はインキ量検知ローラ２
の最大回転速度よりも幾分低い速度比に決めるのが好適
である。A small-diameter disk 22 is fixed to the end of the shaft 21 of the ink amount detection roller 2 in correspondence with such a disk 11 on the driving side. As clearly shown in FIG. 3A, this disk 22 has a smaller diameter than the disk 11 and is provided with a protrusion 23 that protrudes outward in the radial direction.
Based on the speed of the disc 11, the protrusion 23 can engage with the locking piece 15 of the disk 11, or the detection pawl 16 can be placed thereon. In particular, the leading edge of the protruding portion 23 of the disk 22 is bent inward and inclined, as shown in FIG. 6C, so that the leading end of the detection pawl 16 can be easily placed thereon. Note that the reference speed ratio of the disk 11 on the drive side is based on the ink amount detection roller 2.
It is preferable to set the speed ratio to be somewhat lower than the maximum rotational speed of .

この発明の一実施例としてこの様なインキ量検出装置の
検出レバー１７の動きが、第６図に示されるインキ供給
用ポンプ３０の作動機構　。The movement of the detection lever 17 of such an ink amount detection device as an embodiment of the present invention is shown in FIG. 6 as an operating mechanism of an ink supply pump 30.

３１の作動レバー３２に伝達され、インキの補給に自動
的に行われるようになっている。すなわち、インキ供給
用ポンプ６０の作動機構３１は図示される様に軸３３に
より枢支された作動レバー３２と、インキチューブ６４
の口部が接続されたポンプ６０のピストンロッド３５の
端部に下端が係止された揺動レバー３６と、揺動レバー
３６の上端に一端が連結され他端に係止ピン３８を有す
る連結アーム３７と、連結アーム３７の係止ピン３８が
係合自在な切欠４０を有し水平方向に往復動可能にガイ
ド４２，４３にはゾ水平に保持案内される水平作動枠３
９と、水平作動枠５９の他端と三角形の枢動ブラケット
４４を介して上端にて連結され下端が駆動歯車４６の偏
心体４７に連結されて常時上下動されている作動アーム
４５とから構成されている。31 and is transmitted to the operating lever 32, so that ink replenishment is automatically performed. That is, the operating mechanism 31 of the ink supply pump 60 includes an operating lever 32 pivotally supported by a shaft 33 and an ink tube 64 as shown in the figure.
A swinging lever 36 whose lower end is locked to the end of the piston rod 35 of the pump 60 to which the mouth of the pump 60 is connected, and a connection having one end connected to the upper end of the swinging lever 36 and a locking pin 38 at the other end. The arm 37 has a notch 40 in which the locking pin 38 of the connecting arm 37 can freely engage, and the horizontal operation frame 3 is horizontally held and guided by the guides 42 and 43 so as to be able to reciprocate in the horizontal direction.
9, and an operating arm 45 that is connected at its upper end to the other end of the horizontal operating frame 59 via a triangular pivot bracket 44, and whose lower end is connected to an eccentric body 47 of a drive gear 46 so as to be constantly moved up and down. has been done.

この様に構成されたこの発明の輪転謄写機のインキ量検
出装置においては、第１，２．３Ａ、３Ｂ図に示される
様に、印刷版胴１は電動機（図示しない）により一定速
度で駆動され、従って駆動側のディスク１１は印刷版胴
１に直結されたプーリ３、ベルト４、プーリ５、ベルト
６、プーリ７、軸８を介して常に一定速度比で回転され
ている。他方、印刷版胴１，１１にインキ層を介して圧
接されるインキ量検知ローラ２，２′はインキ量に応じ
て回転数が変化し、インキ量が十分あるときには印刷版
胴との摩擦抵抗は少なくなり、インキ量検知ローラ２，
２１の回転数が遅くなり、従ってインキ量検知ローラ２
に直結されたディスク２２は駆動側のディスク１１より
も回転が遅く、第２Ａ、２Ｂ図に示される様に速く回転
する方の、駆動側のディスク１１の係止片１５がディス
ク２２の突出部２３に当接し、検出ディスク１２の検出
づめ１６はディスク１１の切欠窓１４を通ってディスク
２２の外周の空所部分に第２図の如く突出するようにな
り、ディスク１２の表面に接触する検出コロ１８を介し
て検出レバー１７はばね１９にて図示の様な引張れた状
態になる。検出レバー１７のこの状態は適宜な機械的手
段によって作動レバー３２に伝えられて作動レバー３２
を第６図に示される位置に保持する。作動レバー３２の
この状態においては水平作動枠３９の切欠４０が連結ア
ーム３７のピン３８から外れており、水平作動枠３９は
空動きするだけで、ポンプ３０はまだ作動されない。In the ink amount detection device for a rotary copying machine of the present invention constructed in this manner, the printing plate cylinder 1 is driven at a constant speed by an electric motor (not shown), as shown in Figures 1, 2.3A, and 3B. Therefore, the drive-side disk 11 is always rotated at a constant speed ratio via the pulley 3, belt 4, pulley 5, belt 6, pulley 7, and shaft 8 that are directly connected to the printing plate cylinder 1. On the other hand, the ink amount detection rollers 2 and 2', which are pressed into contact with the printing plate cylinders 1 and 11 through an ink layer, change their rotational speed according to the amount of ink, and when there is a sufficient amount of ink, the frictional resistance with the printing plate cylinder increases. decreases, and the ink amount detection roller 2,
21 becomes slower, so the ink amount detection roller 2
The disk 22 directly connected to the disk 22 rotates slower than the disk 11 on the driving side, and as shown in FIGS. 23, the detection pawl 16 of the detection disk 12 passes through the cutout window 14 of the disk 11 and protrudes into the space on the outer periphery of the disk 22 as shown in FIG. The detection lever 17 is brought into a tensioned state as shown in the figure by the spring 19 via the roller 18. This state of the detection lever 17 is transmitted to the actuation lever 32 by suitable mechanical means.
is held in the position shown in FIG. In this state of the operating lever 32, the notch 40 of the horizontal operating frame 39 has come off the pin 38 of the connecting arm 37, the horizontal operating frame 39 only moves idly, and the pump 30 is not yet operated.

印刷が進み印刷版胴１，１１上のインキが少なくなって
印刷版胴との摩擦抵抗が大きくなると、インキ量検知ロ
ーラ２，２１の回転数が速くなっていき、やがて一定の
基準速度比で回転するディスク１１の回転よりも速くな
る。このときに、インキ量検知ローラ２に直結されたデ
ィスク２２は突出部２３が検出ディスク１２の検出づめ
１６の先端部分に当って検出づめ１６を押しのけて検出
ディスク１２を軸８に沿って外側に向って滑動し、ディ
スク１１の係止片１５に当接し、検出レバー１７は検出
コロ１８を介して枢軸まわりに枢動される。このときの
状態が第４．５Ａ、５Ｂ図に示されている。検出レバー
１７のこの様な動きは、ポンプ３４の作動機構３１の作
動レバー３２に伝えられて作動レバー３２が軸３３まわ
りに反時計方向に枢動され、従って作動レバー３２の右
端が水平作動枠３９のピン４１に係合してピン４１を介
して水平作動枠３９を持上げるので、切欠４０が連結ア
ーム３７のピン３８に係合して連結アーム３７を介して
揺動レバー６６を作動し、ピストンロッド３５を動かし
てポンプ３０を作動し、インキチューブ３４からインキ
が吸引されて印刷版胴１゜１′にインキが補給される（
第６図）。As printing progresses and the amount of ink on the printing plate cylinders 1, 11 decreases and the frictional resistance with the printing plate cylinders increases, the rotational speed of the ink amount detection rollers 2, 21 increases, and eventually the rotation speed reaches a constant reference speed ratio. The rotation speed becomes faster than the rotation of the rotating disk 11. At this time, the protrusion 23 of the disk 22 directly connected to the ink amount detection roller 2 hits the tip of the detection pawl 16 of the detection disk 12 and pushes the detection pawl 16 away, causing the detection disk 12 to move outward along the shaft 8. The detecting lever 17 is pivoted about the pivot via the detecting roller 18. The state at this time is shown in Figures 4.5A and 5B. This movement of the detection lever 17 is transmitted to the actuating lever 32 of the actuating mechanism 31 of the pump 34, and the actuating lever 32 is pivoted counterclockwise around the shaft 33, so that the right end of the actuating lever 32 moves toward the horizontal actuating frame. 39 and lifts the horizontal operating frame 39 via the pin 41, the notch 40 engages with the pin 38 of the connecting arm 37 and operates the swing lever 66 via the connecting arm 37. , the piston rod 35 is moved to operate the pump 30, ink is sucked from the ink tube 34, and the printing plate cylinder 1°1' is replenished with ink (
Figure 6).

インキの補給が行われて印刷版胴１，１′上にインキが
十分な量補給されると、印刷版胴との摩擦抵抗によって
インキ量検知ローラ２，２′の速度が遅くなり、先に説
明した様に第２ｊＡ。When ink is replenished and a sufficient amount of ink is replenished onto the printing plate cylinders 1, 1', the speed of the ink amount detection rollers 2, 2' is slowed down due to frictional resistance with the printing plate cylinders, and As explained, 2nd jA.

３Ｂ図に示される状態になり、従って水平作動枠３９の
切欠４０が連結アーム３７のピン３８から外れてポンプ
３０が停止され、インキの補給が終了する。3B, the notch 40 of the horizontal operating frame 39 is disengaged from the pin 38 of the connecting arm 37, the pump 30 is stopped, and ink replenishment is completed.

発明の効果 この様に、この発明の輪転謄写機のインキ量検出装置に
依れば、印刷版胴側の一定速度比で回転される駆動側の
ディスクに対し、印刷版胴に圧接されるインキ層を介し
てのインキ量検知ローラと印刷版胴の摩擦抵抗にもとづ
くインキ量検知ローラ直結のディスクの回転数の変化に
よる両ディスクの回転主従依存の転換を検出し、これを
機械的または電気的手段をもってインキ供給用ポンプの
作動機構の作動レバーに伝え、ポンプを作動してインキ
を補給するようなし、簡単な構成で安価に製作でき、確
実にインキ供給用ポンプを作動して所定量のインキ補給
を自動的に行うことができる等の効果を奏するものであ
る。Effects of the Invention As described above, according to the ink amount detection device for a rotary copying machine of the present invention, the ink that is pressed against the printing plate cylinder against the drive side disk that is rotated at a constant speed ratio on the printing plate cylinder side. Based on the frictional resistance between the ink amount detection roller and the printing plate cylinder through the layer, the change in the rotation speed of the disk directly connected to the ink amount detection roller is detected, and the change in the rotational dependence of both disks is detected mechanically or electrically. The device transmits the signal to the actuating lever of the actuating mechanism of the ink supply pump, and operates the pump to replenish ink.It has a simple structure and can be manufactured at low cost, and it reliably operates the ink supply pump to supply a predetermined amount of ink. This has the advantage of being able to automatically replenish supplies.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図はこの発明のインキ量検出装置の一実施例が設け
られた輪転謄写機の一部を示す側面概要図、第２図は第
１図のこの発明のインキ量検出装置を、インキ量が十分
あるときの状態を示す平面図、第３Ａ図および第３Ｂ図
は第２図の３Ａ−３Ａ線および５Ｂ−３Ｂ線に沿った断
面図、第３Ｃ図は両ディスクの突出部および係止部と　
　　　゛検ｉづめの関連を示す平断面部分図、第４図は
インキ量が少なくなったときの第２図と同様な図、第５
Ａ図および第５Ｂ図は第４図の５Ａ−５Ａ線および５Ｂ
−５Ｂ線に沿った断面図、第６図は第１．２．４図のこ
の発明のインキ量検出装置と連動して用いられるインキ
供給用ポンプの作動機構の正面図である。図中、１，１
１：印刷版胴、２．２１　：インキ量検知ローラ、３，
５．７：プーリ、　４．６：ベルト、８，２１　：軸、
１１：ディスク、１２：検出ディスク、１４：切欠窓、
１５：係止片、１６：検出づめ、１７：検出レバー、１
８：検出コロ、２２：ディスク、２３：突出部、３２：
作動レバー、３０：ポンプ、３１：作動機構。FIG. 1 is a schematic side view showing a part of a rotary copying machine equipped with an embodiment of the ink amount detecting device of the present invention, and FIG. 2 shows the ink amount detecting device of the present invention shown in FIG. 3A and 3B are cross-sectional views taken along lines 3A-3A and 5B-3B in FIG. 2, and FIG. 3C is a plan view showing the state when there is sufficient disk space. Department and
゛A partial plane cross-sectional view showing the relationship between the inspections, Figure 4 is a diagram similar to Figure 2 when the amount of ink decreases, and Figure 5
Figures A and 5B are lines 5A-5A and 5B in Figure 4.
FIG. 6 is a sectional view taken along the line -5B, and a front view of the operating mechanism of the ink supply pump used in conjunction with the ink amount detection device of the present invention shown in FIG. 1.2.4. In the figure, 1,1
1: Printing plate cylinder, 2.21: Ink amount detection roller, 3,
5.7: Pulley, 4.6: Belt, 8,21: Shaft,
11: disk, 12: detection disk, 14: cutout window,
15: Locking piece, 16: Detection pawl, 17: Detection lever, 1
8: detection roller, 22: disk, 23: protrusion, 32:
Actuation lever, 30: pump, 31: actuation mechanism.

Claims (1)

【特許請求の範囲】[Claims] インキ供給装置によりインキが印刷版胴に供給される輪
転謄写機において、印刷版胴の外周面にインキ層を介し
て圧接されインキ量に応じて印刷版胴に対する回転数が
変化するインキ量検知ローラ軸端に設けられ周辺から放
射方向に部分的に突出する突出部を有した小径の第１の
ディスク、印刷版胴軸から伝動機構を介して予め設定さ
れた一定回転数で回転されるよう該小ディスクと同軸上
に隣接して設けられて該突出部に対応する切欠窓と該突
出部と係合すべく内側に屈曲された係止片を有する大径
の第２のディスク、第２のディスクと同軸に軸方向に滑
動可能に設けられ第１、２の両ディスクの回転数の相違
に応じて両ディスクを連結する検出づめを有した検出デ
ィスク、検出ディスクの表面に接触する検出コロを一端
に有した枢動可能な検出レバー、該検出レバーを介して
作動されるようになつたインキ供給装置の作動機構のた
めの作動レバーを備えたことを特徴とする輪転謄写機の
インキ量検出装置。In a rotary copying machine in which ink is supplied to the printing plate cylinder by an ink supply device, an ink amount detection roller that is pressed against the outer peripheral surface of the printing plate cylinder via an ink layer and whose rotation speed relative to the printing plate cylinder changes depending on the amount of ink. A small-diameter first disk provided at the shaft end and having a protrusion partially protruding from the periphery in a radial direction, and adapted to be rotated from the printing plate cylinder shaft at a preset constant rotation speed via a transmission mechanism. a large diameter second disk provided coaxially and adjacent to the small disk and having a cutout window corresponding to the protrusion and a locking piece bent inward to engage with the protrusion; A detection disk is provided coaxially with the disk so as to be slidable in the axial direction, and has a detection pawl that connects both the first and second disks according to the difference in the number of rotations of both the disks, and a detection roller that contacts the surface of the detection disk. Ink quantity detection for a rotary copying machine, characterized in that it comprises a pivotable detection lever having at one end, an actuation lever for an actuation mechanism of an ink supply device adapted to be actuated via said detection lever. Device.