Section 408.12463. Point of operation devices.

Rule 2463. (1) Point of operation devices shall protect the operator by 1 of the following methods:

(a)  Preventing or stopping, or both, the normal stroking of a press if the operator's hands are inadvertently placed in the point  of  operation.

(b)   Withdrawing an operator's hands if they are inadvertently located  in the point of operation as the dies close or preventing the operator from inadvertently reaching into the point of operation as the dies close.

(c)   Preventing the operator from inadvertently reaching into the point of operation at all times.

(d)   Requiring the application of both of the operator's hands to the machine's operating controls and locating the controls at a distance from the point of operation that will permit the slide to complete the downward travel or stop before the operator can reach into the point  of  operation with his or her hands.

(e)   Enclosing the point of operation before a press stroke can be initiated and maintaining this closed condition until the  motion  of  the slide ceases.

(f)  Enclosing the point of  operation  before   a  press  stroke  can   be initiated so as to prevent an operator from reaching into the point of operation before die closure or before cessation of  slide  motion  during the downward stroke.

(2)  A gate or movable barrier device shall protect  the  operator   as follows:

(a)   A type-A gate or movable barrier device shall protect the operator as prescribed in subrule (1)(e) of this rule.

(b)   A type-B gate or movable barrier device shall protect the operator as prescribed in subrule (1)(f) of this rule.

(3)   The presence-sensing point of operation device shall protect the operator as provided in subrule (1)(a) of this rule  and  shall  be interlocked into the control circuit to prevent or stop slide motion if the operator's hand or other body part is within the sensing field of  the device during the downstroke of the press  slide.   All  of the  following provisions apply to a presence-sensing point of operation device:

(a)   The device shall not be used on machines   that  use  full-revolution clutches.

(b)   The device shall not be used as a tripping means to  initiate   slide motion.

(c)   The device 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 the  initiation  of  a  successive stroke until the failure is corrected. The failure shall be  indicated  by the system.

(d)  Bypassing the protection function of a presence-sensing device during the upstroke of the press slide is permitted for the purpose of parts ejection, circuit checking, and feeding.

(e)   The safety distance (Ds) from the sensing field   to  the  point  of operation shall be greater than the distance that is   determined  by   the following formula:

Ds = 63 inches/second x T where:

Ds = minimum safety distance (inches);

63 inches/second - hand speed constant; and

Ts = stopping time of the press measured approximately at the  90   degree position of crankshaft rotation (seconds).

(f)  Guards shall be used to protect all areas of entry to the point  of operation that are not protected by the presence-sensing device.

(4)   The pull-out device shall protect  the  operator  as  prescribed   in subrule (1)(b) of this rule and shall include attachments for each of the operator's hands. All of the following  provisions  apply  to  a  pull-out device:

(a)   Attachments shall be connected to, and operated only by, the press slide or upper die.

(b)   Attachments shall be adjusted to prevent the operator from reaching into the point of operation or to withdraw the operator's hands from the point of operation or other pinch points before the dies close.

(c)   A separate pull-out device or other safeguarding device that is in compliance with the provisions of this part shall be provided for each operator if more than 1 operator is used on a press.

(d)  Each pull-out device in use shall be visually inspected and checked for proper adjustment at the start of each operator's shift, after a  new die setup, or when operators are changed. Necessary maintenance or repair, or both, shall be performed and completed before the press is returned to production. The employer shall maintain records of these  inspections  and the maintenance work performed.

(e)   Bolts, locator pins, or any other projections shall not be located in a manner that would catch the pullback cable or wristlet and  hold  an operator's hand in a pinch point or the point of operation.

(5)    A sweep device shall not be used for point of operation safeguarding on a mechanical power press.

(6)   A holdout or a restraint device shall protect the operator as prescribed in subrule (1)(c) of this rule and     shall    include    attachments for each of the operator's

hands. These  attachments  shall  be  securely anchored and adjusted so that the operator is restrained from reaching into the point of operation. A separate set of restraints or  other safeguarding device that is in compliance with the provisions   of this part shall be provided for each operator if more than 1 operator is required on a press.

(7)   The 2-hand control device shall protect the operator as prescribed in subrule (1)(d) of this rule. All of  the  following  provisions  apply  to  a 2-hand control device:

(a)   When used in press operations requiring more  than  1   operator, separate 2- hand controls shall be provided for each operator and shall be designed to require concurrent applications of all operator's controls to activate the slide. The removal of a hand from any  control  button   shall cause the slide to stop.

(b)   Each 2-hand control that is used as a point of operation device shall be operated in the single-stroke mode only.

(c)    When hand-in-die loading or unloading is used, the safety distance (Ds) between each 2-hand control device and the point of operation shall be greater than the distance   determined  by  the  formula   prescribed  in subrule (3)(e) of this rule.

(d)  The position of the 2-hand controls shall be established and fixed in accordance with the provisions   of  subrule  (1)(d)   of  this  rule   or subdivision  (c)  of  this subrule, whichever  shall   apply.  Only  the supervisor or safety engineer may authorize relocating the controls.

(8)    The 2-hand trip device shall protect the operator as prescribed in subrule (1)(d) of this rule. The device shall conform as follows:

(a)   When used in press operations that require more than 1 operator, separate 2- hand trips shall be provided for each operator and shall be designed to require concurrent application of all  operator's   controls  to activate the slide.

(b)   Each  2-hand  trip  shall  meet  the  construction  requirements  of  R 408.12434.

(c)   The safety distance (Dm) between the 2-hand trip and the point of operation shall be greater than the distance determined  by   the   following formula:

Dm = 63 inches/second x Tm; where:

Dm = minimum safety distance (inches); 63 inches/second = hand  speed constant; and

Tm = the maximum time the press takes for the die closure after it has been tripped (seconds). For full-revolution clutch presses that have only 1 engaging point, Tm is equal to the time necessary for 1 1/2 revolutions of the crankshaft. For full-revolution clutch presses that have more than 1 engaging point, Tm shall be calculated as follows:

1      time necessary      -----     to complete  1         revolution of the Tm = 1/2 +

Number of X crankshaft   engaging   (seconds)   points per  revolution

(d)   Two-hand trips shall be established and fixed and only a supervisor or safety engineer may authorize their relocation.

History: 1979 AC; 1990 AACS; 1993 AACS.