Ohio Administrative Code › Title 4123:1 - Division of Safety and Hygiene › Chapter 4123:1-5 - Workshops and Factories › Section 4123:1-5-10 - Mechanical power presses

Current through all regulations passed and filed through July 1, 2024
(A) Scope.
The 
									specifications of this rule pertain to mechanical
				power presses. Excluded from the 
									specifications of this rule are press brakes (when
				used for bending, see paragraph (F) of this rule), hydraulic and pneumatic
				power presses, bulldozers, hot bending and hot metal presses, forging presses
				and hammers, riveting machines and similar types of fastener applicators. For
				guarding of these excluded machines, see rule
				4123:1-5-11 of the
				Administrative Code.
(B)
			 Reserved.
(C) Mechanical power
			 press guarding.
(1) Brakes.
Friction brakes provided for stopping or holding the slide
				movement 
										will be inherently self-engaging by requiring power or
				force from an external source to cause disengagement. Brake capacity
				
										will be
				sufficient to stop the motion of the slide quickly and capable of holding the
				slide and its attachments at any point in its travel.
(2) Machines using full revolution clutches.
(a) Single-stroke mechanism.
Machines using full revolution clutches
				
											will
				incorporate a single-stroke mechanism.
(b) Compression-type springs.
If the single-stroke mechanism is dependent upon spring action,
				the spring(s) 
											will be of the compression type, operating on a rod or
				guided within a bore or tube and designed to prevent interleaving of the spring
				coils in event of breakage.
(c) Two-hand trip.
A two-hand trip 
											will have the individual operator's hand controls
				protected against unintentional operation and have the individual operator's
				hand controls arranged by design and construction and/or separation to require
				the use of both hands to trip the press and use a control arrangement requiring
				concurrent operation of the individual operator's hand controls.
(d) Anti-repeat feature.
Two-hand trip systems on full revolution clutch machines
				
											will
				incorporate an anti-repeat feature.
(e) Multiple-station presses.
Where two-hand trip systems are used on multiple-station
				presses, there 
											will be a separate set of controls for each
				assigned employee.
(3) Foot pedals (treadle).
(a) Pedal mechanism.
The pedal mechanism 
											will be protected to prevent unintended operation
				from falling or moving objects or by accidental stepping onto the pedal.
(b) Pedal return springs.
If pedal return springs are provided they
				
											will be
				of the compression type, operating on a rod or guided within a bore or tube,
				and designed to prevent interleaving of spring coils in event of
				breakage.
(c) Pedal
			 counterweights.
If pedal counterweights are provided, the path of the travel of
				the weight 
											will be enclosed.
(4) Hand-operated levers.
(a) Spring latch.
Hand-lever-operated power presses 
											will be
				equipped with a spring latch on the operating lever to prevent premature or
				accidental tripping.
(b)
			 More than one operating station.
The operating levers on hand-tripped presses having more than
				one operating station 
											will be interlocked to prevent the tripping of
				the press except by the concurrent use of all levers.
(5) Machines using part revolution
			 clutches.
(a) Clutch/brake control.
The clutch 
											will release and the brake
				
											will be
				applied when the external clutch engaging means is removed, deactivated or
				deenergized.
(b) Stop
			 control.
A red color stop control 
											will be
				provided with the clutch/brake control system. Momentary operation of the stop
				control 
											will immediately deactivate the clutch and apply the
				brake. The stop control 
											will override any other control, and reactuation
				of the clutch will require use of the operating (tripping) means
				which has been selected.
(c) Control selection.
A means of selecting "off," "inch," "single stroke," and
				"continuous" (when the "continuous" function is furnished)
				
											will be
				supplied with the clutch/brake control to select type of operation of the
				press.
(d) Inch operating
			 means.
An inch operating means 
											will be
				provided and 
											will prevent exposure of the employee's hands within
				the point of operation by:
(i)
			 Requiring the concurrent use of both hands to actuate the clutch, or
(ii) Being a single control protected against
			 accidental actuation and so located that the employee cannot reach into the
			 point of operation while operating the single control.
(e) Two-hand controls for single stroke.
Two-hand controls for single stroke 
											will conform to
				the following 
											specifications:
(i) All controls 
											will be
			 protected against unintended operation.
(ii) The two-hand control system
			 
											will
			 permit an adjustment which will require concurrent pressure from both hands
			 during the die closing portion of the stroke.
(iii) The two-hand control system
			 
											will
			 incorporate an anti-repeat feature.
(iv) The control system
			 
											will
			 require the operator to release all hand controls before an interrupted stroke
			 can be resumed.
(v) Where two-hand
			 trip controls are used on multiple-station presses, there
			 
											will be
			 a separate set of controls for each designated employee. Controls
			 
											will be
			 activated and deactivated in sets of two. The clutch/brake control system
			 
											will
			 prevent actuation of the clutch if all operating stations are
			 bypassed.
(vi) The starting of a
			 continuous run 
											will require a separate action by the operator in
			 addition to the setting for continuous stroking of the press before actuation
			 of the operating controls will result in continuous stroking.
(vii) If foot control is provided, the
			 selection method between foot or hand control 
											will be
			 separate from the stroking selector and 
											will be
			 designed so that the selection may be supervised by the employer.
(viii) Foot-operated controls
			 
											will be
			 guarded to prevent accidental operation.
(ix) Clutch/brake control systems
			 
											will
			 automatically deactivate in the event of failure of power or pressure supply
			 for clutch engaging or failure of air supply. Reactivation
			 
											will
			 require restoration of normal power or air and the use of the tripping
			 mechanisms.
(x) Turnover bar
			 operation 
											will be performed only when the power source is
			 deenergized.
(6) Electrical.
(a) Disconnect switch.
A main power disconnect switch capable of being locked only in
				the "off" position 
											will be provided with every power press control
				system.
(b) Motor start
			 button.
The motor start button 
											will be
				protected against accidental operation.
(c) Drive motor starter.
All mechanical power press controls 
											will
				incorporate a type of drive motor starter that will disconnect the drive motor
				from the power source in the event of control voltage or power source failure,
				and require operation of the motor start button to restart the motor when
				voltage conditions are restored to normal.
(d) Accidental ground.
All clutch/brake control electrical circuits
				
											will be
				protected against the possibility of an accidental ground in the control
				circuit causing false operation of the press.
(7) Slide counterbalance systems.
(a) Spring counterbalance systems.
Spring counterbalance systems when used
				
											will:
(i)
			 Incorporate means to retain system parts in event of breakage, and
(ii) Have the capability to hold the slide
			 and its attachments at midstroke, without brake applied.
(b) Air counterbalance cylinders.
Air counterbalance cylinders 
											will:
(i) Incorporate means to retain the piston
			 and rod in case of breakage or loosening;
(ii) Have adequate capability to hold the
			 slide and its attachments at any point in stroke, without brake applied;
			 and
(iii) Incorporate means to
			 prevent failure of capability (sudden loss of pressure) in event of air supply
			 failure.
(8)
			 Air controlling equipment.
Air controlling equipment 
										will be
				protected against foreign material and water entering the pneumatic system of
				the press. A means of air lubrication 
										will be provided when needed.
(9) Hydraulic equipment.
The maximum anticipated working pressures in any hydraulic
				system on a mechanical power press 
										cannot exceed the safe working
				pressure rating of any component used in that system.
(10) Pressure vessels.
All pressure vessels used in conjunction with power presses
				
										will
				conform to the most current edition of "American Society of Mechanical
				Engineers Code for Pressure Vessels."
(11) Control reliability.
When 
										specified by paragraph (D)(5) of this rule, the
				control system 
										will operate so that a failure within the system
				does not prevent the normal stopping action from being applied to the press
				when 
										specified, but 
										will prevent
				initiation of a successive stroke until the failure is corrected. The failure
				will be
				detectable by a simple test, or indicated by the control system. This
				
										specification does not apply to those elements of the
				control system which have no effect on the protection against point of
				operation injuries.
(12)
			 Brake system monitoring.
When 
										specified by paragraph (D)(5) of this rule, the
				brake monitor 
										will:
(a)
			 Automatically prevent the activation of a successive stroke if the stopping
			 time or braking distance deteriorates to a point where the safety distance
			 being utilized does not meet the 
										specifications set forth in paragraphs (D)(3)(c)(v)
			 and (D)(3)(g)(iii) of this rule.
The brake monitor used with the type B gate or movable barrier
				device 
											will be installed in a manner to detect slide top-stop
				overrun beyond the limit established by the employer.
(b) Indicate when the performance of the
			 braking system has deteriorated to the extent described in paragraph (C)(12)(a)
			 of this rule; and
(c) Monitor the
			 brake system performance on each stroke.