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Subchapter 7. General Industry Safety Orders
Group 8. Points of Operation and Other Hazardous Parts of Machinery
Article 55. Power Operated Presses

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§4193. Machines Using Part Revolution Clutches.

(a) The clutch shall release and the brake shall be applied when the external clutch engaging means is removed, de-activated, or de-energized.

(b) A red color stop control shall be provided with the clutch/brake control system. Momentary operation of the stop control shall immediately de-activate the clutch and apply the brake. The stop control shall override any other control, and re-actuation of the clutch shall require use of the operating (tripping) means which has been selected.

EXCEPTION: Mechanical press brakes.

(c) A means of selecting Off, "Inch," Single Stroke, and Continuous (when the continuous function is furnished) shall be supplied with the clutch/brake control to select type of operation of the press. Fixing of selection shall be by means capable of supervision by the employer.

(d) The "Inch" operating means shall be designed to prevent exposure of the worker's hands within the point of operation by:

(1) Requiring the concurrent use of both hands to actuate the clutch, or

(2) Being a single control protected against accidental actuation and so located that the worker cannot reach into the point of operation while operating the single control.

(e) Two-hand controls for single stroke shall conform to the following requirements:

(1) Each hand control shall be protected against unintended operation and arranged by design, construction, and/or separation so that the concurrent use of both hands is required to activate the press.

(2) The control system shall be designed to require concurrent pressure from both hands during the die closing portion of the stroke.

(3) The control system shall incorporate an antirepeat feature.

(4) The control systems shall be designed to require release of all operators' hand controls before an interrupted stroke can be resumed.

(f) Controls for more than one operating station shall be designed to be activated and deactivated in complete sets of two operators' hand controls per operating station by means capable of being supervised by the employer. The clutch/brake control system shall be designed and constructed to prevent actuation of the clutch if all operating stations are bypassed.

(g) Those clutch/brake control systems which contain both single and continuous functions shall be designed so that completion of continuous circuits may be supervised by the employer. The initiation of continuous run shall require a prior action or decision by the operator in addition to the selection of Continuous on the stroking selector, before actuation of the operating means will result in continuous stroking.

(h) If foot and hand controls are provided, the selection method between hand and foot control shall be separate from the stroking selector and shall be designed so that the selection may be supervised by the employer.

(1) For those machines using pull back or restraining devices, the control system shall be such that when the foot control is used the necessary safeguards shall be required before the machine will operate.

(i) The control of air-clutch machines shall be designed to prevent a significant increase in the normal stopping time due to a failure within the operating valve mechanism, and to inhibit further operation if such failure does occur. This requirement shall not apply to machines intended only for continuous, automatic feeding applications.

(j) The clutch/brake control shall automatically de-activate in event of failure of the power or pressure supply for the clutch engaging means. Re-activation of the clutch shall require restoration of normal supply and the use of the activating control(s).

(k) The clutch/brake control shall automatically de-activate in event of failure of the counter-balance(s) air supply. Re-activation of the clutch shall require restoration of normal air supply and use of the activating control(s).

(l) Selection of bar operation shall be by means capable of being supervised by the employer. A separate pushbutton shall be employed to activate the clutch, and the clutch shall be activated only if the driver motor is de-energized.

(m) Where the operator feeds or removes parts by placing one or both hands in the point of operation, and a two-hand control, presence sensing device or Type B gate or movable barrier is used for safeguarding:

(1) The employer shall use a control system and a brake monitor which comply with Sections 4193(o) and 4200(b).

(2) The control of air clutch machines shall be designed to prevent a significant increase in the normal stopping time due to a failure within the operating valve mechanism, and to inhibit further operation if such failure does occur, where a part revolution clutch is employed.

(n) The employer shall provide means for handling scrap from roll feed or random length stock operations. Scrap cutters used in conjunction with scrap handling systems shall be safeguarded in accordance with Section 4236.

(o) When required by Section 4193(m) the control system shall be constructed so that a failure within the system does not prevent the normal stopping action from being applied to the press when required, but does prevent initiation of a successive stroke until the failure is corrected. The failure shall be detectable by a simple test, or indicated by the control system. This requirement does not apply to those elements of the control system which have no effect on the protection against point of operation injuries.

NOTE: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code.

HISTORY

1. Amendment filed 7-17-75; effective thirtieth day thereafter (Register 75, No. 29).

2. Amendment filed 10-31-85; effective thirtieth day thereafter (Register 85, No. 44).

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